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The 19th Amendment was ratified, which allowed all women to vote in elections.
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On November 2nd, KDKA in Pittsburgh made the first radio broadcast.
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On March 4, 1921, Warren G. Harding was sworn into office and became the 29th president of the USA.
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The Emergency Quota Act limited the number of immigrants that were allowed into the USA every year. The act said that the number of immigrants allowed in every year was equal to 3% of the current USA population.
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On August 2nd, Warren Harding died of what we believe to be cardiac arrest. This led to Coolidge becoming the new US president.
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After the voting took place, Calvin Coolidge was declared to have won the presidency, giving him a second term.
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On April 10th, F. Scott Fitzgerald released what is now known as one of the greatest novels ever made.
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A trial that determined that the teaching of evolution in the classroom doesn't violate church or state religion laws, but just prohibits the teaching of evolution on the grounds of intellectual disagreement.
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In 1928, the election took place, and Herbet Hoover won, making him become the 31st president.
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In 1928, Disney's "Steamboat Willie" premiered, which was the debut of their mascot, Mickey Mouse.
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In 1929, the stock market crashed, which marked the start of the Great Depression