A. World War I (1914–1918) – the first truly global conflict that reshaped the world’s geopolitical landscape
B. The Gold Rush (Late 1840s–1850) – when hundreds of thousands of fortune-seekers migrated to California
C. Prohibition (1920–1933) – when the US banned the manufacture, sale, and transportation of alcohol
D. The Reconstruction Era (1865–1877) – after the Thirteenth Amendment, abolishing slavery and involuntary servitude, was passed
