The Grand Canyon becomes a national park, Michael Jackson's "Thriller" album hits No. 1, a truck bomb explodes under the World Trade Center, and teenager Trayvon Martin is shot and killed, all on this day.
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Library of Congress
1887: Hall of Fame baseball pitcher Grover Cleveland Alexander, who won 373 games and struck out 2,198 over 20 seasons with the Philadelphia Phillies, Chicago Cubs, and St. Louis Cardinals, is born in Elba, Neb. Alexander won a World Series championship with the Cardinals in 1926.