1787: Delegates gather in Philadelphia to draw up the Constitution of the United States

1796: English country doctor Edward Jenner administers his revolutionary cowpox-based vaccine for smallpox, in Berkeley, Gloucestershire

1804: Meriwether Lewis and William Clark’s expedition sets out from St. Louis for the Pacific Coast, commissioned by Thomas Jefferson

1853: Land surveyor, newspaper publisher and inventor Gail Borden patents his process for condensed milk

1948: David Ben-Gurion declares Israel independent from British administration, Golda Meir one of the signatories

1955: Warsaw Pact is signed by the Soviet Union, Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland and Romania

Source: Onthisday.com