1922 - The first issue of The Journal for Personnel Research is published by the Personnel Research Foundation.

1923 - President Warren Harding, left, dies in office; Vice President Calvin Coolidge is sworn in as president.

1924 - Hawthorne Effect studies, shown at right, begin, showed workers were more productive when they thought they were being studied.

1925 - The Brotherhood of Sleeping Car Porters, above, the first U.S. labor group led by African-Americans, is formed.

1927 - First transatlantic telephone call is made between New York and London. Incidentally, the first "videophone" call took place in April of that year.

1929 - Herbert Hoover, left, is sworn in as president of the United States.

1929 - Stock market crashes, which starts the Great Depression.

1932 - Police open fire at 3,000 unemployed auto workers marching at the Ford River Rouge Plant in Dearborn, Michigan, killing four people.

1932 - Franklin Delano Roosevelt is sworn in as president.

1933 - Frances Perkins, above, becomes secretary of labor; she is the first woman to be named to a presidential Cabinet.

1935 - FDR signs Social Security and National Labor Relations acts into law.

1936 - The United Auto Workers organized the Flint Sit-Down Strike, which helps propel the UAW's national exposure.

1938 - Congress passes the Fair Labor Standards Act establishing the 40-hour workweek and minimum wage, and banning child labor.

1941 - U.S. officially enters World War II after Japan attacks Pearl Harbor, right.

1942 - The song Rosie the Riveter is released. The name catches on and becomes a symbol for women working in factories during World War II.

1944 - 1945 - World War II ends. Between November 1944 and September 1945, U.S. employment drops by 4.3 million.

1945 - Vice President Harry Truman is sworn in as president when FDR dies in office.

1946 - The first electronic digital computer, known as ENIAC, is introduced. It takes up an entire room.

1946 - Baby boomer generation begins.

1946 - President Truman signs Executive Order 9981, which eliminates segregation in the U.S. military.

1948 - The American Society for Personnel Administration is founded. The group later changes its name to the Society for Human Resource Management.

1953 - Dwight Eisenhower becomes president.

1955 - Ray Kroc founds McDonald's Corp. Five years later Kroc would buy exclusive rights to the McDonald's name and help oversee its worldwide expansion.

1956 - Eisenhower signs the Federal-Aid Highway Act, which creates the Interstate Highway System.

1957 - The FBI arrests Teamster leader Jimmy Hoffa and charges him with bribery.

1960 - First civil rights sit-in takes place at a Woolworth's food counter in Greensboro, North Carolina.

1961 - John F. Kennedy is sworn in as president.

Generation X begins in the early 1960s.

1962 - Sam Walton opens his first Wal-Mart store in Rogers, Arkansas. Today, the company is the world's largest private employer.

1963 - The Feminine Mystique by Betty Friedan, above, is published, sparking a new wave of feminism in the U.S.

1963 -JFK is assassinated; Vice President Lyndon Johnson is sworn in as president.

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