1940 to 1949
April 1, 1940 - The 1940 census indicates a United States population of 132,164,569. This represented an increase of 7.3% since 1930, the lowest rate of increase in the 20th century. The center of the United States population was geographically placed two miles southeast by east of Carlisle, Indiana.
September 28, 1941 - Ted Williams ends the 1941 season with a batting average over 0.400, the last player to accomplish that feat.
December 7, 1941 - The attack on Pearl Harbor, Hawaii, commences at 7:55 a.m. when Japanese fighter planes launch a surprise attack on United States soil, destroying the U.S. Pacific Fleet docked at the base. This attack, which took the greatest amount of U.S. naval life in history with 1,177 sailor and marines perishing in the attack, as well as the loss or damage to twenty-one naval ships, led to the entry of American troops into World War II. One day later, the United States of America declares war on Japan, officially entering World War II. On December 11, 1941, the United States declares war on Germany and Italy, responding to their declaration of war against America. (4.39)
This is a remake, short color clip: https://www.youtube.com/watch?v=P-ZSem5F08M
February 19, 1942 - Executive order 9066 is signed into law by President Franklin D. Roosevelt, confining 110,000 Japanese Americans, including 75,000 citizens, on the West Coast into relocation camps during World War II. The remains of the first of these detention camps resides in California's Manzanar National Historic Site. These camps would last for three years.
June 21, 1943 - Race riots in Detroit and Harlem cause forty deaths and seven hundred injuries. (5.48)
June 22, 1944 - The G.I. Bill of Rights is signed into law, providing benefits to veterans.
April 1, 1946 - Four hundred thousand mine workers begin to strike, with other industries following their lead.
June 6, 1946 - The Basketball Association of America, known as the National Basketball Association (NBA) since 1949 after its merger with the rival National Basketball League, is founded.
April 15, 1947 - Jackie Robinson breaks Major League Baseball's barrier against colored players when he debuts at first base for Branch Rickey's Brooklyn Dodgers. (2.16) https://www.youtube.com/watch?v=bt17YLJWaJQ
July 26, 1948 - Executive Order 9981, ending segregation in the United States military, is signed into effect by President Harry S. Truman.