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The Roaring Twenties: Boom, Prohibition, and the Decade That Made Modern America

How a single decade gave America cars, radio, jazz, closed borders, and a crash.
A 1920s American city street at dusk with early automobiles, electric signs, and a crowded sidewalk

The 1920s arrived on the far side of a war and an influenza pandemic, and Americans spent the decade deciding what to do with peace. What they did was buy things. Between 1920 and 1929 national income rose by roughly a third, automobile registrations tripled, and installment credit put refrigerators, radios, and Model Ts in houses that had never carried debt before. A country that had been mostly rural in 1910 was, by the 1920 census, mostly urban — and the culture that came out of those cities moved faster than the institutions meant to govern it.

That is only half the decade. The same years produced a constitutional ban on alcohol, an immigration law built on national-origin quotas, a revived Ku Klux Klan with millions of members, and mass arrests of suspected radicals. Prosperity was uneven: farm prices never recovered from the wartime peak, and Black Americans who moved north during the Great Migration found segregation waiting for them in different clothing. This guide follows both currents — the boom and the backlash — from Warren G. Harding's election through the October morning in 1929 when the market stopped cooperating.

Start Here
The Roaring Twenties
The decade in one place: prosperity, prohibition, and a cultural break with everything that came before it.
Normalcy and Its Scandals
Warren G. Harding
Harding won the 1920 election on a promise of "normalcy" — a retreat from war, reform, and Wilsonian internationalism alike.
Teapot Dome Scandal
The oil-lease bribery scheme that sent a sitting Cabinet secretary to prison and defined the Harding administration's reputation after his death.
Calvin Coolidge
Coolidge governed by subtraction, cutting taxes and federal activity on the theory that the business of America was business.
Herbert Hoover
Commerce secretary through the boom and president for its collapse, Hoover inherited the decade's consequences seven months into his term.
The Dry Decade
Eighteenth Amendment
Ratified in 1919 and in force from January 1920, the amendment wrote a ban on the manufacture and sale of alcohol into the Constitution itself.
Prohibition Era
Thirteen years of enforcement produced speakeasies, bootlegging fortunes, and an organized-crime economy that outlasted the law that created it.
Twenty-First Amendment
The only amendment ever passed to repeal another, ratified in December 1933 after Prohibition's costs became politically unpayable.
Cars, Credit, and the Machine Age
The Ford Model T
By the time production ended in 1927, more than 15 million Model Ts had reorganized where Americans lived, worked, and spent Sundays.
Henry Ford
Ford paid five dollars a day to keep an assembly line staffed, and in doing so helped invent the worker who could afford the product.
General Motors
GM answered Ford's single black car with annual model changes and installment financing, and passed him in sales before the decade ended.
The First Mass Culture
Radio
Commercial broadcasting began in 1920, and within a decade a majority of American households heard the same voices on the same night.
Hollywood
The studio system consolidated in the 1920s, and the arrival of sound in 1927 turned moviegoing into the country's dominant leisure habit.
Babe Ruth
Ruth's home runs, amplified by radio and wire-service photography, made him the first athlete famous to people who had never seen a game.
Lindbergh's Transatlantic Flight
The solo crossing to Paris in May 1927 drew a welcome-home crowd of four million and demonstrated how fast the new media could manufacture a hero.
F. Scott Fitzgerald
Fitzgerald named the Jazz Age and then spent The Great Gatsby explaining why he distrusted it.
Harlem and the New Voices
The Harlem Renaissance
The Great Migration concentrated Black writers, musicians, and painters in a few square miles of Manhattan, and the work they produced there reached a national audience.
Langston Hughes
Hughes built poems out of blues rhythms and ordinary speech, insisting that Black vernacular was material enough for serious literature.
Women After the Vote
Nineteenth Amendment
Ratification in August 1920 opened the decade by doubling the electorate, though the unified women's voting bloc reformers expected never materialized.
Margaret Sanger
Sanger opened the first legal birth control clinic in 1923 and pushed reproductive control into public argument — carrying eugenic commitments that later admirers have had to reckon with.
Who the Boom Shut Out
Immigration Act of 1924
The Johnson-Reed Act set national-origin quotas designed to freeze the country's ethnic composition, and it governed American immigration for forty years.
The Indian Citizenship Act
The same Congress that closed the borders in 1924 extended citizenship to Native Americans born in the United States, though several states withheld the vote for decades after.
Red Scare
The Palmer Raids of 1919 and 1920 arrested thousands and deported hundreds, setting the decade's limits on dissent before it properly began.
The End of the Party
Great Mississippi Flood of 1927
The worst river flood in American history displaced hundreds of thousands, exposed the boom's indifference to the rural South, and pushed Black voters toward a political realignment.
Stock Market Crash of 1929
Three days of selling in late October 1929 ended the decade's central assumption — that the market only went up.

The decade's ending is its own subject: see the Great Depression and the New Deal for what the crash set in motion, and the Progressive Era for the reform politics the 1920s largely abandoned.

#Arts & Culture #Economy #Prohibition