1901 Assembly Line invented
1914 World War I Begins
1915 Albert Einstein formulates Theory of Relativity
1920 American women gain right it vote with the 19th Amendment
1928 Alexander Fleming invents penicillin
1929 Great Depression begins
1939 World War II begins
1941 Japanese bomb Pearl Harbor, U.S. declares war
1945 World War II Ends after U.S. drops atomic bombs on Japan
1955 Rosa Parks refuses to give up her seat on the bus-sparks the Civil Rights movement
1957 U.S.S.R. launches Sputnik - "Space Race" begins
1963 U.S. President John F. Kennedy is assassinated
1963 Civil Rights Movement March on Washington
1965 Vietnam War Begins
1969 First astronauts walk on the surface of the Moon
1972 U.S. President Richard Nixon visits Communist China
1981 Personal Computer introduced
1989 Berlin Wall is torn down, representing the fall of Communism and the end of the Cold War
1991 Persian Gulf War Begins
1997 Sheep Cloned