The Making of America: How U.S. Cities Grew, 1492 to Today

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Last updated: September 2026

This interactive map shows the history of American cities in motion. Press play and watch five centuries unfold: Spanish, French and English outposts on the coasts, a young republic crossing the Appalachians, river towns turning into railroad hubs, and railroad hubs turning into skylines. Every city grows by real U.S. Census numbers, decade by decade, and the twenty largest cities rebuild their own skylines, landmark by landmark, in the year each tower was finished.

Below the map you’ll find the story in text: how and why U.S. cities grew where they did, the largest cities in every era, the race for America’s tallest building, and a short history of each of today’s twenty biggest cities.

How to use the map

Press play to run the story from 1492 to today. The camera stops at each turning point, from Jamestown and the Louisiana Purchase to the Brooklyn Bridge and the Interstate highways, and flies to where it happened. You can also drag the timeline to any year.

Drag to move across the country, scroll or pinch to zoom, and right-drag to tilt. Click any city to fly in low over its downtown: a panel shows its population curve since founding, and the skyline rises around you as you move through time. Close up, the famous buildings are labeled with their name and the year they were completed.

The glowing blue front shows settlement spreading west. Land that was not yet part of the United States stays dim until it joins, so you can watch the country grow: the thirteen colonies, the land west to the Mississippi in 1783, the Louisiana Purchase in 1803, Florida, Texas, Oregon and the Mexican Cession of 1848. During the Civil War, the eleven Confederate states turn red.

Five centuries of American cities

1492–1775: Colonial footholds

When Columbus reached the Caribbean in 1492, the land that became the United States was home to millions of Native people. The first lasting European towns were tiny. Spain founded St. Augustine in 1565, the oldest continuously inhabited European settlement in the country, and Santa Fe in 1610. England’s first permanent colony, Jamestown, followed in 1607, and the Pilgrims landed at Plymouth in 1620. The Dutch settled New Amsterdam on Manhattan in the 1620s, and William Penn laid out Philadelphia on a grid in 1682. By the eve of independence, Philadelphia, New York, Boston and Charleston were the largest towns, each with a few tens of thousands of people at most.

1776–1860: A republic moves west

The first census in 1790 counted just under four million Americans, and no city had even 50,000. The Treaty of Paris in 1783 pushed the border to the Mississippi, and the Louisiana Purchase of 1803 doubled the country. Rivers set the pattern of growth: Pittsburgh, Cincinnati, Louisville and St. Louis rose along the Ohio and Mississippi, and New Orleans became the gateway to the interior. The Erie Canal (1825) linked New York to the Great Lakes and made it the nation’s dominant port, while Buffalo, Rochester, Cleveland and Chicago boomed along the new water route. The Indian Removal Act of 1830 led to the forced removal of Native nations from the Southeast. After the Mexican War, the United States reached the Pacific, and the 1849 Gold Rush turned San Francisco from a village into a city almost overnight.

1861–1900: War, railroads and the closing of the frontier

The Civil War (1861–1865) killed more than 600,000 Americans and left Southern cities such as Atlanta and Richmond in ruins. Afterward, railroads remade the map. The transcontinental line met at Promontory, Utah, in 1869, and new towns sprang up wherever the tracks went: Omaha, Kansas City, Denver, Dallas, Fort Worth and Seattle. Chicago, rebuilt after the Great Fire of 1871, became the country’s rail and meatpacking capital and passed one million people by 1890. That same year the Census Bureau announced that there was no longer a continuous frontier line.

1900–1945: The skyscraper age

Steel frames and safe passenger elevators let cities grow upward. Chicago raised the first skyscrapers in the 1880s, and New York took the race to new heights with the Woolworth Building (1913), the Chrysler Building (1930) and the Empire State Building (1931). Immigration and factory work swelled the industrial cities: Detroit grew from about 286,000 people in 1900 to nearly a million by 1920 on the strength of the auto industry. Streetcars and then the Model T pushed the first suburbs outward, and in 1920 the census found, for the first time, that most Americans lived in urban areas.

1945–1990: Suburbs, freeways and the Sun Belt

After World War II, the GI Bill, cheap mortgages and the 1956 Interstate Highway Act spread cities out instead of up. Places like Levittown mass-produced the ranch house, and many older cities began losing residents to their suburbs: Detroit, Cleveland, St. Louis and Buffalo all peaked around 1950. Air conditioning, military bases and new industries pulled growth south and west. Los Angeles passed Chicago as the nation’s second-largest city in the 1990 census, and Houston, Phoenix, San Diego and Dallas joined the ten largest cities.

1990–today: The return to the city

Since 1990, many downtowns have come back to life, and new towers have reshaped the skylines of New York, Chicago, Seattle, Austin and Charlotte. The 2020 census counted 331 million Americans, about four in five of them in urban areas. Growth is strongest in Texas, Arizona, Florida and the Carolinas, while housing costs have become the defining urban issue of the decade.

The largest U.S. cities by year

The five most populous cities in selected census years, using each city’s population within its official limits at the time.

Two changes in city limits explain some jumps. Philadelphia merged with its surrounding county in 1854, and New York became today’s five-borough city in 1898, when Brooklyn, then the country’s fourth-largest city, joined Manhattan. On the map, both cities are shown with the population of their present-day area throughout.

America’s tallest building, year by year

For more than a century, the title of tallest building in the United States passed almost entirely between New York and Chicago.

Heights are to the architectural top, excluding antennas. The Washington Monument (169 m, 1884) was taller than any building of its time but is a monument, not a building.

How today’s 20 largest cities grew

The 20 most populous U.S. cities in the 2020 census, in order, each with its skyline modeled on the map.

1. New York

Founded by the Dutch as New Amsterdam in the 1620s, New York has been the largest American city since the first census. The five boroughs merged in 1898, and the city grew from 3.4 million people in 1900 to 8.8 million in 2020. Its skyline history runs from the Woolworth Building through the Chrysler and Empire State buildings to One World Trade Center and the supertall towers of Billionaires’ Row.

2. Los Angeles

Founded in 1781 as a small Spanish pueblo, Los Angeles had about 100,000 people in 1900 and nearly 3.9 million in 2020. Oil, film, aviation and freeways built a city that grew out rather than up: a 150-foot height limit kept almost every building except City Hall low until 1957.

3. Chicago

Incorporated in 1833, Chicago became the hub of the nation’s railroads, passed one million people by 1890 and peaked at 3.6 million in 1950. After the Great Fire of 1871 it invented the skyscraper, and it later built the Sears (now Willis) Tower, the country’s tallest building for four decades.

4. Houston

Founded in 1836, Houston grew on cotton, the ship channel and oil, from 44,633 people in 1900 to 2.3 million in 2020. It is the largest U.S. city without formal zoning, and its downtown towers mostly date from the 1970s and 1980s oil boom.

5. Phoenix

Phoenix had just 5,544 residents in 1900 and about 107,000 in 1950. Water projects and air conditioning then made it one of the fastest-growing cities in the country, reaching 1.6 million in 2020, spread wide across the desert rather than stacked in towers.

6. Philadelphia

William Penn’s planned city of 1682 was the largest in the colonies and served as the nation’s capital from 1790 to 1800. A gentlemen’s agreement kept every building below the statue of William Penn atop City Hall until One Liberty Place broke the line in 1987. Philadelphia peaked at 2.07 million in 1950 and had 1.6 million in 2020.

7. San Antonio

Founded in 1718 around the mission now known as the Alamo, San Antonio grew from 53,321 people in 1900 to 1.43 million in 2020. The Tower of the Americas, built for the 1968 World’s Fair, still dominates its skyline.

8. San Diego

The first Spanish settlement in California, founded in 1769, San Diego stayed small until the Navy and aircraft industry arrived. It grew from 17,700 people in 1900 to nearly 1.4 million in 2020. Its downtown towers stop at about 500 feet because of the nearby airport’s flight path.

9. Dallas

Founded in 1841, Dallas took off when two railroads crossed there in the 1870s. It grew from 42,638 people in 1900 to 1.3 million in 2020, with a skyline marked by Reunion Tower and Bank of America Plaza.

10. San Jose

Founded in 1777 as the first civilian town in Spanish California and briefly the state’s first capital, San Jose was a farming center of 21,500 people in 1900. Silicon Valley carried it past one million by 2020, while airport height limits have kept its skyline modest.

11. Austin

Founded in 1839 as the capital of the Republic of Texas, Austin grew from 22,258 people in 1900 to nearly 962,000 in 2020. Protected view corridors to the 1888 State Capitol shape where its new towers can rise.

12. Jacksonville

Founded in 1822 and rebuilt after the Great Fire of 1901, Jacksonville merged with Duval County in 1968, making it the largest city by land area in the contiguous United States. It had 28,429 people in 1900 and nearly 950,000 in 2020.

13. Fort Worth

Founded as an Army outpost in 1849, Fort Worth grew as a cattle-drive stop and stockyard town. It had 26,688 people in 1900 and nearly 919,000 in 2020, one of the fastest gains of any large city in the last two decades.

14. Columbus

Created in 1812 as Ohio’s state capital, Columbus grew steadily with government, universities and industry, from 125,560 people in 1900 to 905,748 in 2020. The 1927 LeVeque Tower was its tallest building for nearly half a century.

15. Indianapolis

Laid out in 1821 as a planned capital around a central circle, Indianapolis merged with Marion County in 1970. It grew from about 169,000 people in 1900 to 887,642 in 2020, and the Soldiers’ and Sailors’ Monument (1901) still marks its center.

16. Charlotte

Founded in 1768, Charlotte stayed a modest Southern town until banking made it one of the country’s financial centers. It grew from 18,091 people in 1900 to 874,579 in 2020, and the 1992 Bank of America Corporate Center remains the tallest building in the Carolinas.

17. San Francisco

A Spanish mission and presidio in 1776, San Francisco became a city in the 1849 Gold Rush. Largely destroyed by the 1906 earthquake and fire, it was rebuilt within a decade. It had 342,782 people in 1900 and 873,965 in 2020, with a skyline that runs from the Golden Gate Bridge to the Transamerica Pyramid and Salesforce Tower.

18. Seattle

Founded in 1851, Seattle boomed as the gateway to the 1897 Klondike Gold Rush and grew from 80,671 people in 1900 to 737,015 in 2020. The Smith Tower (1914) and the Space Needle (1962) are its best-known landmarks.

19. Denver

Founded in 1858 during the Pike’s Peak gold rush, Denver became the supply hub of the Rocky Mountain West. It grew from 133,859 people in 1900 to 715,522 in 2020, and its downtown skyline mostly dates from the energy boom of the early 1980s.

20. Washington, D.C.

The capital was sited in 1790 and the federal government moved there in 1800. The Height of Buildings Act of 1910 keeps its skyline low, so the Capitol dome and the Washington Monument still dominate the view. Washington had 278,718 people in 1900, peaked at about 802,000 in 1950 and had 689,545 in 2020.

From city growth to home values

Where cities grew, land became valuable. The river landing, the rail junction, the streetcar line and the freeway exit each decided which neighborhoods would be in demand a century later. The typical American home cost about $7,400 in 1950 and roughly $123,000 in 1990; today it sells for about $417,700. For how the houses themselves changed, from the Queen Anne Victorian to the ranch and the modern farmhouse, see A Century of Home.

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Frequently asked questions

What was the largest city in the United States in 1776?

Philadelphia was the largest town in the thirteen colonies at independence, with roughly 30,000 to 40,000 people including its suburbs. By the first census in 1790, New York had moved ahead with 33,131 people and has been the largest U.S. city ever since.

When did Los Angeles become bigger than Chicago?

In the 1990 census. Los Angeles counted about 3.49 million people and Chicago about 2.78 million, ending Chicago’s century as America’s second city.

What was the first skyscraper in America?

The Home Insurance Building in Chicago, completed in 1885, is usually called the first skyscraper because it was the first tall building supported by a metal frame. It stood ten stories tall and was demolished in 1931.

Why does Washington, D.C. have no skyscrapers?

The Height of Buildings Act of 1910 limits building heights in the capital based on the width of the street in front, generally to about 130 feet on commercial streets. That is why the Capitol and the Washington Monument still rise above the city.

What does “the closing of the frontier” mean?

After the 1890 census, the Superintendent of the Census reported that the unsettled West had been so broken up by settlement that there was no longer a single frontier line. Historians often use 1890 as the end of the frontier era.

Which large U.S. city has grown the fastest?

Among today’s biggest cities, Phoenix stands out: it grew about fifteen-fold from roughly 107,000 people in 1950 to 1.6 million in 2020. Houston, San Jose, Austin and Fort Worth also multiplied their populations over the same period.

How accurate is the map?

City populations follow U.S. Census counts by decade and are interpolated between census years. The landmark buildings use their real locations, heights and completion years. The rest of each skyline, the spread of settlement and the terrain are a stylized model, and downtown spacing is widened so individual towers stay visible.

Sources and methodology

Population figures come from the U.S. Census Bureau, including Campbell Gibson’s Population of the 100 Largest Cities and Other Urban Places in the United States: 1790 to 1990 and the 2000–2020 decennial censuses. Figures before 1790 are historical estimates. Building heights and completion years follow the Council on Tall Buildings and Urban Habitat. Terrain comes from public-domain NASA elevation data and rivers and lakes from Natural Earth. Home prices are indicative national medians in nominal dollars, as used in A Century of Home.