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1911 - Roald Amundsen reaches the South Pole. Rutherford formulates his theory of atomic structure.

1912 - Edwin Bradenberger invents a process for manufacturing cellophane.

1913 - Woodrow Wilson inaugurated as 28th President of the United States.

1914 - Northern and Southern Nigeria united. Dr. Alexis Carrel performs the first successful heart surgery on a dog.

1915 - Albert Einstein postulates his general theory of relativity.

1916 - World War I blood for transfusion is refrigerated.

1917 - World War I - Sigmund Freud “Introduction to Psychoanalysis.” United States government purchases Dutch West Indies. Woodrow Wilson inaugurated second term as President of the United States.

1922 - Friedrich Bergius successfully hydrogenates coal to oil.

1923 - Teapot dome oil scandal hearings in Washington, DC.

1924 - Hitler sentenced to five years imprisonment; released after eight months. Robert Frost - “A Poem with Notes and Grace Notes” - Pulitzer Prize.

1927 - F. B. Kellogg, United States Secretary of State, suggests pact for renunciation of war.

1929 - Kellogg-Briand Pact comes into force.

1935 - The longest bridge in the world opened over the lower Zambesi.

1936 - Spanish Civil War begins in July.

1937 - Insulin used to control diabetes. The first jet engine built by Frank Whittle.

1940 - World War II.

1941 - United States Savings Bonds and stamps go on sale.

1942 - Magnetic recording tape invented. Bell Aircraft tests first United States jet plane.

1943 - Penicillin successfully used in the treatment of chronic disease.

1944 - D-Day.

1945 - Vitamin A synthesized. First atomic bomb detonated near Almogordo, New Mexico.

1949 - President Harry S. Truman inaugurated President of the United States.

1950 - Einstein attempted to expand the theory of relativity.

1951 - The 22nd amendment to the Constitution passed by Congress.

1952 - First hydrogen bomb (United States) exploded at Eniwetok Atoll, Pacific.

1953 - Queen Elizabeth crowned.

1954 - United States Supreme Court rules that segregation by color in public schools is a violation of the 14th amendment.

1955 - USSR decrees end of war with Germany.

1957 - USSR launches Sputnik I and II, the first earth satellites.

1958 - Alaska becomes the 49th state of the United States.

1959 - Hawaii becomes the 50th state of the United States.

1960 - United States launches a radio reflector satellite.

1962 - United States breaks off diplomatic relations with Cuba.

1966 - Forty-eight hour Christmas truce observed in Vietnam.

1967 - Stanford University biochemists produce synthetic version of DNA.

1975 - United States government cuts off trade with Turkey.

1977 - United States space shuttle “Enterprise” makes its first manned flight.

1979 - Discovery of ring around Jupiter by Voyager spacecraft.

1981 - The United States space shuttle “Columbia” successfully makes its maiden flight.