On this date

In 1862, more than 3,600 men were killed in the Civil War Battle of Antietam in Maryland.

In 1920, the American Professional Football Association — a precursor of the National Football League — was formed in Canton, Ohio.

In 1939, the Soviet Union invaded Poland during World War II, more than two weeks after Nazi Germany had launched its assault.

In 1978, after meeting at Camp David, Israeli Prime Minister Menachem Begin and Egyptian President Anwar Sadat signed a framework for a peace treaty.

In 1987, the city of Philadelphia, birthplace of the U.S. Constitution, threw a big party to celebrate the 200th anniversary of the historic document; in a speech at Independence Hall, President Ronald Reagan acclaimed the framing of the Constitution as a milestone “that would profoundly and forever alter not just these United States but the world.”

In 2001, six days after the Sept. 11 attacks, stock prices nosedived but stopped short of collapse in an emotional, flag-waving reopening of Wall Street; the Dow Jones industrial average ended the day down 684.81 at 8,920.70.

In 2011, a demonstration calling itself Occupy Wall Street began in New York, prompting similar protests around the United States and the world.

Ten years ago: A suicide attack on the U.S. Embassy in Sanaa, Yemen, killed 19 people, including an American woman and six militants.

Five years ago: Engineers declared success as the Costa Concordia cruise ship was pulled completely upright during an unprecedented, 19-hour operation to wrench it from its side where it had capsized off Tuscany in 2012.

One year ago: The top series prizes at the Emmy Awards went to “The Handmaid’s Tale,” “Veep” and “Saturday Night Live.”