How and when did Los Angeles become America’s second largest city

How LA went from pueblo to powerhouse

Los Angeles grew from a small Spanish pueblo into the nation’s second-biggest city through railroads, oil booms, Hollywood, wartime factories, and waves of new residents.

By 1990, LA surpassed Chicago with 3.48 million people, taking the spot just behind New York. Its rise shows how quickly a West Coast city can turn into a U.S. powerhouse.

Each decade added layers: suburbs, studios, airports, and highways. LA’s story is one of constant expansion and reinvention, keeping it firmly on the American map. Let’s take a look at the history.

Early beginnings (pre-1900)

Founded in 1781 as El Pueblo de Nuestra Señora la Reina de los Ángeles de Porciúncula, LA had about 650 residents by 1800. Small ranchos dominated the landscape, and life moved at a slow pace.

After Mexican rule ended in 1848, the city grew to 1,610 by 1850. The arrival of the Southern Pacific Railroad in 1876 triggered a boom. By 1890, the population jumped to over 50,000 as real estate promoters sold the dream of a subtropical paradise to people.

1900-1920’s (infrastructure surge)

By 1900, LA had just over 100,000 people, ranking 36th in the U.S. Ten years later, it hit 319,000 and was sixth. Growth needed water, and the Los Angeles Aqueduct delivered 233 miles from Owens Valley, fueling suburban expansion.

Streetcars and the Pacific Electric “Red Cars” made getting around easier. World War I brought aircraft factories, and Hollywood’s silent films drew crowds, pushing the population to over half a million by 1920.

1920’s oil boom

Southern California became a major oil center in the 1920s. California supplied roughly 30–35% of U.S. crude oil production during the decade, with important fields in the Los Angeles Basin and nearby coastal areas.

Discoveries at Huntington Beach, Signal Hill, and Inglewood created instant fortunes. The 1933 Long Beach earthquake prompted stronger building rules, especially for schools, yet the region’s growth continued.

Citrus farming was still strong, and car ownership skyrocketed, showing LA was booming in every direction.

1930’s Dust Bowl influx

During the 1930s, hundreds of thousands left the Southern Plains for California, and some moved into the Los Angeles region seeking farm and factory work.

The 1932 Olympics put the city on the world stage, while cheap land and booster campaigns kept growth steady despite the Great Depression. LA was becoming both a refuge and a magnet for opportunity.

WWII industrial leap in the 1940s

By 1940, LA had 1.5 million people. War industries exploded, hiring tens of thousands in planes, ships, and defense manufacturing.

The Great Migration brought 50,000 Black Americans, and women joined the workforce as “Rosie the Riveters.” Housing booms and GI Bill-funded neighborhoods pushed the population toward 2 million by 1950.

1950’s freeway and aerospace era

The postwar freeway buildout helped suburbs spread rapidly and made driving the default way to get around. The region’s car culture surged as commuting and suburban development accelerated.

Aerospace jobs and Cold War defense spending fueled growth, while the population reached 2.48 million in 1960. Social tensions bubbled up in events like the Watts Riots, showing that prosperity came with challenges.

1960s-1970’s suburban dominance

By 1970, LA had 2.8 million people. Immigration from Mexico and Asia diversified the city. Hollywood exports and TV shows like Bonanza made LA famous worldwide.

Airports and ports grew massively, handling millions of travelers and containers. Meanwhile, Chicago and other Midwestern cities were starting to lose residents, letting LA rise on open land and opportunity.

1990’s overtake milestone

The 1990 census confirmed LA as the second-largest U.S. city at 3.48 million, surpassing Chicago. Finance and tech booms in the 1980s, along with Latino entrepreneurship, helped propel the city.

Ports grew into major trade hubs, and the metro area’s continued expansion and immigration helped cement L.A.’s status as the West Coast’s powerhouse city.

Chicago decline parallel

Chicago peaked in 1950 with 3.62 million but lost residents due to industrial decline and white flight. LA avoided that fate with open land and new industries.

Today, metro LA has 18 million, trailing only New York’s 20 million. The gap between city proper populations widened after 1990, cementing LA’s second-place status.

2000s-present stability

The population grew steadily with 3.69 million in 2000, 3.79 million in 2010, and nearly 3.9 million in 2020. High costs and recessions slowed growth but didn’t stop it.

The Los Angeles metro economy is among the nation’s largest, with recent estimates around $1.3 trillion, making it a major U.S. economic engine.

How entertainment shaped Los Angeles

Hollywood put LA on the map as the American dream factory. Silent films, then talkies, drew actors, crew, and tourists from across the country, turning neighborhoods like Burbank and Hollywood into global icons.

TV and music industries later cemented LA’s cultural clout. From studios to streaming hubs, the city became a U.S. entertainment powerhouse, influencing pop culture coast to coast.

And when it comes to food, there is an ongoing discussion on Los Angeles taco trucks vs. Austin taquerias: Which city really does tacos better?

Sports and mega-events influence

Sports helped LA grow beyond its streets and studios. The Dodgers’ move from Brooklyn in 1958, the Rams, Lakers, and the Clippers attracted national attention, while the 1984 Olympics showcased the city’s infrastructure and hospitality.

Mega-events like the Super Bowl, All-Star Games, and NCAA tournaments keep LA in the American spotlight. Sports drive tourism can be further elevated with these must-see places in Los Angeles that reveal the city beyond Hollywood and skylines.

So, what part of Los Angeles’ rise surprises you the most, Hollywood’s boom, wartime industry, or the city’s unstoppable growth over the decades? Tell us in the comments.

This slideshow was made with AI assistance and human editing.

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