1901 President William McKinley is assassinated. Theodore Roosevelt becomes the twenty-sixth president of the United States.
1901 Andrew Carnegie sells his business interests to J. Pierpont Morgan.
1903 McClure's Magazine publishes muckraker Ida Tarbell's expose of Standard Oil.
1903 Wilbur and Orville Wright make the first successful airplane flight at Kitty Hawk N.C.
1904 Lincoln Steffens publishes THE SHAME OF THE CITIES.
1905 William "Big Bill" Haywood opens the International Workers of the World (I.W.W.) or Wobblies founding convention in Chicago.
1905 Albert Einstein formulates his Theory of Relativity.
1908 The Ford Motor Company makes the "Model T" for mass sale.
1910 W.E.B. DuBois founds the National Association for the Advanced Colored people(NAACP).
1912 Woodrow Wilson is elected President of the United States.
1914 World War I breaks out in Europe.
1914 Wilson declares that the U.S. will remain neutral.
1915 The Lusitania is sunk by Germany, killing 128 Americans.
1916 Germans create the Blimp or "Zepplin" for the use of raiding Paris.
1917 The U.S. enters W.W.I.
1918 Armistice Day, the war is over; Germany accepts Wilson's Fourteen Points as the basis for peace negotiations.
1919 Wilson delivers his idea for the League of Nations, at the Paris Peace Conference.
1919 President Wilson suffers a stroke.
1919 Attorney General A. Mitchell Palmer announces his plans for the deportation of alleged communists and anarchists.
1919 The U.S. fails to ratify the Treaty of Versailles.
1919 Babe Ruth joins the New York Yankees and helps restore baseball's popularity after the Chicago Black Sox World Series scandal the same year.
1920 The 19th Amendment is passed, giving women the right to vote for the first time.
1920 Republican Warren G. Harding, advocating a "return to normalcy," becomes 29th president.
1923 President Harding dies suddenly, and Vice President Calvin Coolidge becomes 30th president; he is reelected the following year.
1924 Over 2.5 million radios are in use throughout the U.S.
1925 A high-school teacher, John Scopes, is tried and convicted in Tennessee for teaching evolution.
1926 Robert Goddard launches the world's first rocket.
1927 Charles A. Lindbergh flies the "Spirit of St. Louis" across the Atlantic Ocean from New York to Paris in 33.5 hours.
1928 Herbert Hoover becomes the 31st president, defeating Democrat Al Smith in a landslide.
1928 Walt Disney's Mickey Mouse makes his first appearance in Steamboat Willie.
1929 The stock market crashes.
1932 FDR elected 32nd president of United States.
1933 Hitler becomes Chancellor of Germany.
1933-37 New Deal legislation is created and put into effect.
1938 Nazi Germany invades Austria and Sudetenland.
1939 Nazi Germany invades Poland.
1939 Britain and France declare war on Germany.
1939 All German Jews ordered by Nazis to wear yellow stars of David sewn onto their clothes for identification.
1939 Germany occupies Czechoslovakia.
1940 FDR is the first president to be elected three times.
1941 Nazi Germany attacks Russia, violating their "non-aggression pact."
1941 Japan makes a surprise attack on Pearl Harbor.
1941 America declaring war on Japan, enters the second World War.
1942 The United States government orders all Japanese Americans to "relocate to internment camps" for the duration of the war.
1942-45 The Nazis begin systematic murder of Jews, gypsies, homosexuals, and political prisoners in concentration camps.
1944 D-Day: Allied invasion of Normandy beaches in France.
1944 FDR wins fourth term.
1945 FDR, Churchill, and Stalin meet at Yalta in the Crimea.
1945 Hitler commits suicide in Berlin.
1945 FDR dies of a cerebral hemorrhage in Warm Springs, GA. Harry S. Truman is sworn in as the 33rd president.
1945 Germany surrenders; VE Day, May 8th.
1945 The Atom bomb is dropped on the Japanese cities of Hiroshima and Nagasaki.
1945 Japan surrenders; VJ Day, August 15th.
1946 Winston Churchill delivers his "Iron Curtain" speech at Westminster College in Fulton, Missouri.
1946 Power in Japan is transferred from the Emperor to an elected assembly.
1947 President Truman launches the Marshall Plan, giving economic aid to war-crippled European countries.
1947 The Truman Doctrine commits the U.S. to helping any country fighting Communism.
1947 First baseman Jackie Robinson joins the Brooklyn Dodgers, becoming the first black person to sign a contract with a major baseball club.
1948 Harry Truman defeats Thomas E. Dewey in the 1948 presidential election.
1949 Eleven U.S. Communists are found guilty of conspiracy to overthrow the government.
1950 Senator Joseph McCarthy advises President Truman that the State Department is filled with Communists and Communist sympathizers.
1950 The government of North Korea attacks South Korea. American-led United Nations forces enter the Korean War.