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The Interwar Years (1920s)

  • End of WW1

    Allied victory Central Powers victory on the Eastern Front nullified by defeat on the Western Front and Italian Front Fall of all continental empires in Europe (including Germany, Russia, Ottoman Empire and Austria-Hungary) Russian Revolution and Russian Civil War, with the collapse of the Russian Empire and the subsequent formation of the Soviet Union Widespread unrest and revolutions throughout Europe and Asia Creation of the League of Nations.
  • The Treaty of Versailles creates conflict

    In Paris, diplomats representing the combatant nations of World War I sign the Treaty of Versailles, which promises to sustain peace through the creation of the League of Nations but also plants the seed of future conflict by imposing mercilessly stiff reparations upon Germany. The Treaty of Versailles caused German resentment that Hitler capitalized on to gain support and that led to the beginning to World War II. The Treaty of Versailles had a crippling effect on the German economy.
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    The Roaring Twenties

    The Roaring Twenties refers to the decade of the 1920s in Western society and Western culture. It was a period of economic prosperity with a distinctive cultural edge in the United States and Europe, particularly in major cities such as Berlin, Chicago, London, Los Angeles, New York City, Paris, and Sydney.
  • Nineteenth Amendment

    The Nineteenth Amendment is ratified, granting women the right to vote.
  • The Lie Detector

    John A. Larson was a medical student at the University of California when he invented the Polygraph, or lie detector. This devise measured heartbeats and breathing to learn if a person is lying or not. It later included a skin monitoring system to tell if a person is sweating. If a person was sweating and their breathing and pulse became higher, an alarm would sound concluding that the person was lying.
  • the invention of the bread slicer

    Otto Frederick Rowedder of Iowa worked on his idea of a bread slicer since 1912. Finally he completed a machine that could successfully cut and wrap a loaf of bread. This machine was later improved by baker Gustav Papendick.
  • Mickey Mouse

    Walt Disney's Steamboat Willie premieres, introducing the world to a new animated character—Mickey Mouse. Mickey Mouse first appeared in theaters with sound for the first time ever on November 18th, 1928. Mickey symbolizes everything that Disney was back in the 'Roaring Twenties' which was positive, upbeat, popular, and all for family.
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    The Great Depression

    The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. The timing of the Great Depression varied across the world; in most countries, it started in 1929 and lasted until the late 1930s.
  • The Stock market collapse

    The stock market crash of 1929—considered the worst economic event in world history—began on Thursday, October 24, 1929, with skittish investors trading a record 12.9 million shares. On October 28, dubbed “Black Monday,” the Dow Jones Industrial Average plunged nearly 13 percent.
  • End of Prohibition

    The increase of the illegal production and sale of liquor (known as “bootlegging”), the proliferation of speakeasies (illegal drinking spots) and the accompanying rise in gang violence and other crimes led to waning support for Prohibition by the end of the 1920s. In early 1933, Congress adopted a resolution proposing a 21st Amendment to the Constitution that would repeal the 18th. The 21st Amendment was ratified on December 5, 1933, ending Prohibition.