Hoover sent in troops to remove the Bonus Army because he feared they might become violent.

The availability of credit in the 1920s increased the amount of debt Americans had.

Russia sold Alaska to the United States for $10 million.

The Harlem Renaissance was an African American cultural movement during the 1920s.

Immigration in the 1920s increased dramatically due to a lack of restrictions on immigration.

Organized crime grew as a result of Prohibition, especially in cities.

As a result of World War I, the United States became both an economic and military power.

The U.S. did not ratify the Treaty of Versailles because it did not want to join the League of Nations and be pulled into future wars.

Marcus Garvey was the U.S. Secretary of State who pushed for the purchase of Alaska.

The United States entered World War I in 1914, right after the war began.

The Dust Bowl affected the East Coast of the United States.

The Espionage and Sedition Acts made anti-war protests illegal, as well as anything deemed anti-government, including not joining the draft.