A look back at the week in history
April 4, 1968 Martin Luther King Jr. is assassinated in Memphis, setting off rioting in cities nationwide.
April 5, 1792 George Washington uses the first presidential veto, denying a bill that would divide House seats in favor of northern states.
April 6, 1917 The United States enters World War I.
April 7, 1954 President Dwight Eisenhower delivers his "domino theory" speech on stopping communism's spread in Southeast Asia.
April 9, 1865 Confederate Gen. Robert E. Lee surrenders his army, all but ending the Civil War.