20 of the most important events in US history By caelamont14 1879 The light bulb Period: May 4, 1886 to May 4, 1886 The Haymarket Riot 1890 Morrill Acts 1891 Creation of the Populist Party 1898 Spanish-American War 1904 The National Child Labor Committee (NCLC) 1905 Niagara Movement 1917 US enters WW1 1917 Espionage Act 1917 New Opportunities for Women 1918 National Labor War Board 1918 the end of WW1 1919 The Eighteenth Amendment 1919 the Nineteenth Amendment 1919 The Flu Pandemic 1920 The Automobile 1929 The Stock Market Crash 1929 The Great Depression 1932 Franklin Roosevelt elected president 1935 Social Security Act