On this date in history: In 1935, U.S. Congress passed legislation establishing Big Bend National Park in southwest Texas. The park opened to visitors July 1, 1944. In 1939, the National Baseball Hall of Fame and Museum was dedicated at Cooperstown, N.Y. In 1963, a sniper killed civil rights leader Medgar Evers outside his home in Jackson, Miss. In 1967, the U.S. Supreme Court ruled that states couldn't outlaw interracial marriages. In 1971, Tricia Nixon, daughter of U.S. President Richard