The post-WWI period in America saw significant social, political, and economic changes. The Spanish Flu pandemic killed over 40 million worldwide. Labor unrest increased as workers went on major strikes in 1919. The 18th Amendment established Prohibition, while the 19th Amendment granted women's suffrage. Xenophobia grew due to fears of radicalism, fueling the First Red Scare and Palmer Raids targeting immigrants. Racial tensions erupted in major race riots across several cities. The economy initially struggled as wartime production ended before entering a boom in the 1920s.