U.S. History II By annamarie93 Feb 18, 1930 The planet Pluto was discovered. Jan 12, 1931 the first clinical use of Penicillin Feb 1, 1931 The "Star Spangled Banner" became our national anthem. May 1, 1931 On May 1st 1931, the world's tallest building, the Empire State Building, was opened by President Hoover in New York. Oct 12, 1931 The television was in its infancy Mar 4, 1932 President Roosevelt was elected. Apr 6, 1934 The United States pulls its troops from Haiti. Jul 15, 1934 Central Nebraska had experienced more than 20 days with temperature over 100 degrees. Aug 2, 1934 Hitler becomes Germany's Fuhrer. Feb 27, 1935 The Social Security Act set up a program to ensure an income for the elderly Mar 4, 1936 President Roosevelt was re-elected. May 6, 1937 The German Hindenburg air ship burned to the ground in less than two minutes by a spark the size of an ant. May 9, 1937 The major painting of the decade was titled "Guernica" by Pablo Picasso Jul 13, 1938 The famous American women pilot, Amelia Earhart, disappeared on a flight around the world. Sep 1, 1939 The Wizard of Oz made it's screen debut.