On this day in 1787, the United States Constitution was signed in Philadelphia.
On this day in 1849, American abolitionist Harriet Tubman escaped from slavery.
On this day in 1957, Malaysia joined the United Nations.
On this day in 2001, the New York Stock Exchange reopened for trading after the September 11 attacks, the longest closure since the Great Depression.
Also on this day in 2011, Occupy Wall Street movement began in Zuccotti Park, New York City.