Today in history: On March 7, 1965, a march by over 500 civil rights demonstrators was violently broken up at the Edmund Pettus Bridge in Selma, Alabama; state troopers and a sheriff’s posse fired tear gas and beat marchers with batons in what became known as “Bloody Sunday.” Also on this date: In 1876, Alexander Graham Bell received a U.S. patent for his telephone. In 1936, Adolf Hitler ordered his troops to march into the demilitarized Rhineland, thereby breaking the Treaty of Versailles and