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2026-03-09 04:21:16

Timeline: A Century of White House Renovation Costs

This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

The White House is both a family residence and the operational nerve center of the U.S. executive branch. Over the past century, it has undergone dozens of renovations, some cosmetic, others structural, and a few extraordinarily expensive.

The visualization above, created by USAFacts using a wide variety of government records, tracks major renovation projects since 1920. All figures are adjusted to FY2025 dollars, offering a clearer comparison of how costs have evolved over time.

For most of the last 100 years, upgrades to America’s most famous address have remained relatively modest. But a small number of projects—particularly in 2008 and again in 2025—stand dramatically apart from the rest of the timeline.

Early Structural and Functional Additions

In the early 20th century, renovations focused on expansion and functionality. The 1930 West Wing reconstruction ($3.8 million) and the 1942 East Wing addition helped modernize operations as the executive branch grew.

Other updates were smaller but culturally notable. Franklin D. Roosevelt added an indoor swimming pool in 1933 (about $561,000 in today’s dollars), while Harry Truman approved the Truman Balcony in 1948 for roughly $202,000.

By 1949, however, structural deterioration forced a far more serious intervention. The residence renovation that year cost $72 million (in 2025 dollars), effectively gutting and rebuilding much of the interior to prevent collapse, serving as a reminder that even historic landmarks require periodic overhauls.

Cold War to Late 20th Century: Media and Modernization

As the presidency evolved, so did the building. The 1969 Press Room addition reflected the growing role of television media, while a bowling alley was installed in 1973 for about $299,000.

Through the late 20th century, most projects remained relatively contained in scope and cost. Compared to today’s federal budget, now in the trillions annually, these upgrades were fiscal footnotes.

21st Century: Security and Scale

The 2000s marked a turning point. In 2004 and 2006, East and West Wing upgrades and Situation Room improvements ranged from $5-6 million.

Then came the 2008 East & West Wings renovation, totaling $561 million, which was the largest confirmed project in the past century. The scale reflected heightened security requirements, aging infrastructure, and expanded operational needs in the post-9/11 era.

Most recently, a proposed 2025 ballroom addition is estimated at $200–400 million. If completed at the upper end, it would rank among the most expensive White House projects ever recorded.

Over a century, the data suggests a clear pattern: while the White House regularly evolves with the presidency, only rare moments, such as structural crises or sweeping modernization efforts, produce nine-figure price tags.

Learn More on the Voronoi App

For more historical comparisons on federal outlays, check out Comparing U.S. Government Spending (1980 vs Today) on Voronoi, and explore how priorities and price tags have shifted over time.

2026-03-09 03:48:17

Mapped: How Europe’s Economic Center Has Shifted Since 1950

This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

Europe’s economic balance point has been slowly drifting east for decades.

This map traces the continent’s GDP-weighted “center of gravity” from 1950 to 2022, showing how Europe’s economic core has shifted from near Cologne toward Munich over time.

The visualization, created by The European Correspondent using data from the Maddison Project Database, reveals how decades of growth in Central and Eastern Europe have gradually reshaped the continent’s economic geography.

What Is an Economic “Center of Gravity”?

The economic center of gravity is a geographic point calculated by averaging countries’ locations weighted by their GDP. In simple terms, it marks the location where Europe’s economic activity would balance if GDP were distributed like weight on a map.

As economies grow or shrink relative to each other, the center moves accordingly. When western economies dominate, the center shifts west; when eastern or southern regions grow faster, the point moves in their direction.

This method provides a simple but powerful way to visualize long-term changes in regional economic influence.

Postwar Europe: Western Dominance

In the decades following World War II, Europe’s economic core sat firmly in the northwest. Industrial powerhouses like Germany, France, the UK, and the Benelux countries drove most of the continent’s output.

This concentration kept the center of gravity near Cologne in the mid-20th century. Western Europe’s rapid reconstruction and integration—through institutions like the European Economic Community—reinforced this geographic economic core.

Germany in particular has long played an outsized role in Europe’s economy. In fact, the country’s output rivals that of dozens of its neighbors combined.

The Rise of the East

Since the end of the Cold War, the center has gradually shifted eastward.

The collapse of the Soviet bloc opened Central and Eastern European economies to global trade and investment. Countries like Poland, Czechia, and Hungary integrated into EU supply chains and saw rapid economic expansion.

More recently, fast-growing economies in Southeastern Europe and Türkiye have added additional pull. Together, these changes nudged Europe’s economic center toward Bavaria, landing near Munich by 2022.

Germany Still Anchors Europe’s Economy

Despite this eastward movement, the center remains firmly inside Germany.

This reflects Germany’s continued role as Europe’s industrial engine. Its manufacturing sector, export strength, and central location keep it at the heart of the continent’s economic geography.

In other words, while Eastern Europe is rising, Germany’s gravitational pull still holds the balance point nearby, at least for now.

Learn More on the Voronoi App

See where workers in Europe generate the most GDP per hour on the Voronoi app.

2026-03-09 00:45:59

Mapped: U.S. States With the Highest Diabetes Rates

See visuals like this from many other data creators on our Voronoi app. Download it for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

West Virginia has the highest diabetes prevalence in the U.S., with 15% of adults diagnosed, according to the latest data from the CDC.

The map above shows how diabetes rates compare across all 50 states using the CDC U.S. Diabetes Surveillance System for 2023. Several Southern states rank among the highest in the country, while parts of the Mountain West and New England report some of the lowest prevalence levels.

The South Has the Highest Diabetes Rates

Many of the states with the highest diabetes prevalence are located in the U.S. South. West Virginia leads the nation, with 15% of adults diagnosed with diabetes, followed by Mississippi (14.7%) and Louisiana (14.5%).

Other Southern states—including Alabama, Arkansas, Tennessee, and South Carolina—also report rates well above the national average. These patterns are often linked to higher rates of obesity, lower physical activity levels, and socioeconomic disparities.

Texas also ranks among the higher-prevalence states, with 12% of adults diagnosed with diabetes.

Most States Cluster Near the National Average

Despite large differences at the extremes, many states fall close to the U.S. average of 10.3%. States such as Kansas and Virginia sit almost exactly at this level.

Several populous states—including California, Illinois, and North Carolina—also report prevalence rates slightly above the national average. This clustering suggests that while regional trends exist, diabetes remains a widespread health challenge across the entire country.

Public health initiatives focusing on prevention, early screening, and lifestyle changes remain central to reducing these rates.

Lower Rates in the Mountain West and New England

Some of the lowest diabetes prevalence rates appear in the Mountain West and parts of New England. Vermont reports the lowest rate at 7.7%, followed by Montana and New Hampshire at 7.9%.

Colorado and Utah also report relatively low rates at around 8%, while several Northeastern states—including Massachusetts and Connecticut—remain below the national average.

Learn More on the Voronoi App

If you enjoyed today’s post, check out Mapped: Alcohol Spending Per Capita, by U.S. State on Voronoi, the new app from Visual Capitalist.

2026-03-08 22:31:09

The Countries Producing the Most Geothermal Power

See visuals like this from many other data creators on our Voronoi app. Download it for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

Electricity demand is rising as artificial intelligence, manufacturing reshoring, and electrification drive new power needs worldwide. That is putting renewed focus on geothermal power, a renewable energy source that can run around the clock.

Unlike solar or wind, geothermal plants generate electricity using heat from beneath the Earth’s surface, making them a reliable source of always-on clean power.

This treemap visualization ranks countries by installed geothermal power capacity, based on data from Global Energy Monitor, showing where this underground energy resource is most developed today.

Geothermal Power By Country

Dive into the data, which considered geothermal sites with one megawatt of operating capacity or more, below:

Rank	Country	Operating Capacity (MW)
1	United States	3,734
2	Indonesia	2,432
3	Philippines	1,937
4	Türkiye	1,726
5	New Zealand	1,377
6	Mexico	941
7	Italy	834
8	Kenya	817
9	Iceland	779
10	Japan	618
11	Costa Rica	253
12	El Salvador	211
13	Nicaragua	159
14	Chile	81
15	Russia	50
16	Guatemala	46
17	Croatia	36
18	Honduras	35
19	Papua New Guinea	30
20	Portugal	24
21	Germany	19
22	Guadeloupe	15
23	Taiwan	5
24	Canada	5
25	Iran	5
26	Hungary	3
27	France	2

The U.S. dominates geothermal production with a capacity of 3,734 megawatts, topping the next largest producer by 1,300 megawatts.

That said, Asia as a region leads in production. While sitting in second and third place, Indonesia and the Philippines surpass the U.S. when counted together, at 2,432 and 1,937 megawatts, respectively.

Their position on the “Ring of Fire,” where three tectonic plates collide and create volcanic activity, means they have vast geothermal potential.

The Americas also sit on major geothermal resources, though many fields remain underdeveloped. Some countries have developed their resources more quickly. Mexico ranks sixth globally with 941 MW of capacity.

Italy, the home of geothermal, and Iceland are Europe’s biggest producers at 834 megawatts and 779 megawatts respectively. Though Europe leads on renewables more broadly, geothermal is physically limited to these few volcanic countries.

Iceland has a large capacity relative to its population and has one of the more developed geothermal industries globally, heating around 85% of houses in the country.

Kenya is the only African country to make the list, with its 817 megawatts of power capacity. Appetite to exploit geothermal in the Great Rift Valley, a tectonic trench spanning several countries on the continent, has increased in recent years but the industry remains young.

The Growing Potential of Geothermal

Globally, geothermal makes up just 1% of global electricity demand, but more and more sites are becoming viable thanks to advances in technology.

Existing geothermal plants harness energy from sites with highly permeable rocks, often under a thin layer of crust, making it easier to extract. Newer techniques, known as enhanced geothermal, include fracturing rock to unlock heat and push it to the surface by using a fluid. Next generation geothermal could account for 15% of global electricity demand growth to 2050, per the IEA.

As re-shoring industries and the build out of AI continues at pace, the availability of energy will dictate where manufacturing hubs emerge. Geothermal can operate 24-hours a day, seven days a week, making it particularly compelling as a base load power that is currently serviced by fossil fuels.

Learn More on the Voronoi App

To learn more energy, check out this graphic which charts which countries generate the most electricity.

2026-03-08 20:03:18

Mapped: The States With the Most U.S. Military Bases

See visuals like this from many other data creators on our Voronoi app. Download it for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

The United States operates 335 military installations across all 50 states and Washington, D.C., forming the domestic backbone of the world’s largest military force.

This map shows how those bases are distributed across the country, revealing which states host the most U.S. military infrastructure.

California leads the nation with 34 installations, while just six states account for more than one-third of all bases nationwide.

Data comes from Military OneSource (2026).

California and the San Diego Hub

As the largest state in the country, California unsurprisingly hosts the most military installations (34) of the country, with close to 10% of all official U.S. bases being located in the state.

San Diego County, in the southwestern corner of the state, houses 16 such installations for different military branches such as the U.S. Navy and the Coast Guard, as well as the U.S. Marine Corps’ major West Coast base at Camp Pendleton.

The Pacific Fleet of the U.S. Navy, while formally headquartered in Hawaii’s famous Pearl Harbor facility, also has as its principal homeport the Naval Base San Diego, which is the world’s second-largest surface ship naval base behind only Virginia’s Naval Station Norfolk.

North Carolina’s Bragg Controversy

Across the country, the far smaller state of North Carolina houses nine of its own military installations, with the most prominent being Fort Bragg. With over 50,000 soldiers of the U.S. Army, Fort Bragg is one of the world’s largest and most populous military bases.

Fort Bragg was established in 1918 during the First World War and was initially named after Braxton Bragg, a Confederate general. In 2023, the base was renamed Fort Liberty owing to controversy surrounding the legacy of Confederate military leaders.

By 2025, however, the fort reverted to its original name, this time in honor of Roland Bragg, an Army paratrooper who took part in the Second World War. The various name changes were estimated to have cost the U.S. Department of Defense upwards of $12-14 million.

Different Branches in Different States

Across the United States, different branches of the military are concentrated in different states based around geographic and strategic needs. Colorado (7), for example, hosts three different Space Force bases, while to a lesser extent Nevada (5) serves as a hub for the U.S. Air Force.

Some bases even have highly specialized missions. One of Georgia’s 12 military installations, for example, is the Naval Submarine Base Kings Bay, which sits on the state border with Florida.

This base serves as home port for the U.S. Atlantic Fleet’s ballistic missile nuclear submarines, a core component of U.S. international power projection.

Learn More on the Voronoi App

If you enjoyed today’s post, check out How Much Land does the U.S. Military Control in Each State? on Voronoi, the new app from Visual Capitalist.

2026-03-08 17:42:59

Mapped: Where Wild Bison Now Roam Across Europe

This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

Once roaming widely across Europe, the European bison, also known as the wisent, nearly vanished entirely due to centuries of hunting and habitat loss. By the early 1900s, the species had been driven to extinction in the wild.

Today, however, conservationists are witnessing a remarkable comeback. Using the latest data from Białowieski Park Narodowy and visualized by The European Correspondent, the map above shows where free and semi-free bison populations now roam across Europe.

Europe: Home Again to the Wild Bison

Below is a look at the locations and herd sizes of European bison populations across the continent.

Eastern Europe clearly dominates the map, with Poland, Belarus, and surrounding countries hosting the largest herds. The single biggest group lives in Poland’s Białowieża Forest with roughly 779 animals, making it one of the most important strongholds for the species.

What Happened to Europe’s Original Wild Bison?

The European bison once roamed forests and grasslands across nearly the entire continent. However, centuries of deforestation, agricultural expansion, and hunting drastically reduced their range.

By 1927, the last wild European bison had been killed. The species survived only in zoos and private reserves, leaving conservationists with just a handful of individuals to rebuild the population.

All modern European bison descend from a small captive group of only about a dozen founders. This bottleneck created genetic challenges that conservationists still manage today.

The Conservation Effort That Brought Them Back

The species’ survival is largely thanks to coordinated international conservation efforts. Breeding programs began in captivity during the 1920s before animals were gradually reintroduced into protected landscapes.

Organizations such as Rewilding Europe have since helped restore herds in multiple regions, from the Carpathian Mountains to parts of Western Europe. Reintroductions often occur in large forest ecosystems where human disturbance is limited.

Countries leading bison recovery efforts include:

• Poland: Home to the largest population and the historic Białowieża Forest herd
• Romania: Expanding rewilding programs in the Southern Carpathians
• Belarus: Hosting several large established populations
• Germany and the Netherlands: Smaller but symbolically important reintroductions

These programs often work in tandem with protected areas. In fact, Europe has significantly expanded conservation zones in recent decades, with countries like Poland having a large share of protected land.

Where Could Bison Expand Next?

While populations remain concentrated in Eastern Europe, conservationists believe the continent could support far more bison than exist today.

Large wilderness corridors—particularly in the Carpathians, Balkans, and parts of Scandinavia—offer suitable habitats for expansion. Even Western Europe is experimenting with smaller rewilding projects.

For example, bison now graze in coastal dunes near Amsterdam in the Netherlands, while Spain reintroduced a small herd in the Encinares region in 2020.

If these projects continue to succeed, the European bison’s story could become one of the continent’s most notable wildlife recoveries, offering proof that even species pushed to the brink can return with sustained conservation efforts.

Learn More on the Voronoi App

Explore how conservation projects are helping restore wildlife populations across the continent in Some Wildlife Conservation Efforts Are Working in Europe, available on the Voronoi app.