1919

The Treaty of Versailles was signed, officially ending World War I. The treaty imposed harsh reparations on Germany and redrew the map of Europe, leading to significant geopolitical changes. The treaty also established the League of Nations, an international organization aimed at maintaining peace.

The 18th Amendment, which established Prohibition in the U.S., was ratified in 1919. This amendment banned the production, sale, and transportation of alcohol, leading to the Prohibition era that lasted until 1933.