20th Century US History By graham.810 Sep 6, 1901 President McKinley Assassinated Dec 17, 1903 Wright Brothers First Flight Nov 11, 1918 World War 1 ends Jan 23, 1931 Star Spangled Banner Adopted as National Anthem Sep 2, 1945 World War 2 Ends Jul 27, 1953 Korean War Ends Aug 21, 1959 Alaska and Hawaii become States Jan 30, 1961 Bay of Pigs Invasion Apr 4, 1968 MLK assassinated Apr 30, 1975 Vietnam War Ends Jan 28, 1986 Challenger explodes
