1415 - Henry the Navigator, the prince of Portugal, embarked on an expedition to Africa.
1777 - The Marquis de Lafayette arrived in the American colonies to help with their rebellion against the British. Though very young Lafayette proved a very good military leader and consultant and even ran an agent net to gather intelligence on the British foe. One of these agents James Armistead provided intelligence of extreme value in the Battle of Yorktown.
1825 - Walter Hunt patented the safety pin. Hunt then then sold the rights for $400. Ahem, congratulations MR Hunt you invented the ancient Roman fibula or toga pin.
1866 - The 14th Amendment to the U.S. Constitution was passed by the U.S. Congress. It was ratified on July 9, 1868. The amendment was designed to grant citizenship to and protect the civil liberties of recently freed slaves. It did this by prohibiting states from denying or abridging the privileges or immunities of citizens of the United States, depriving any person of his life, liberty, or property without due process of law, or denying to any person within their jurisdiction the equal protection of the laws.
1878 - Congress of Berlin begins, determines the territories of the states in the Balkan peninsula following the Russo-Turkish War of 1877–78.
1888 - The U.S. Congress created the Department of Labor.
1900 - China's Boxer Rebellion against foreigners and Chinese Christians erupted into violence. This action eventually turned against the diplomatic legations in the Chinese capital Peking and with the backing of the Dowager Empress resulted in a siege against the diplomatic compound.
1920 - The U.S. Post Office Department ruled that children may not be sent by parcel post. This makes me think that there may have been an attempt to do so.
1923 - The French set a trade barrier between the occupied Ruhr and the rest of Germany.
1940 - Paris was evacuated before the German advance on the city.
1943 - German spies landed on Long Island, New York. They were soon captured. This was the German Operation "Pastorius" and was more of a sabotage mission than a straight intelligence gathering operation. Two things went wrong with this Abwehr operation. One is that the senior leader of the operation had no desire to see it through and ultimately turned himself in to US authorities before any actual action had been taken. 2 the German team was discovered by a US Coast Guardsman on beach patrol. The young guardsman was smart enough to pretend to take a bribe for silence from the Germans, knowing that he couldn't outfight all of them and immediately left the area to report his discovery.
1944 - Germany launched 10 of its new V1 rockets against Britain from a position near the Channel coast. Of the 10 rockets only 5 landed in Britain and only one managed to kill (6 people in London).
1949 - Bao Dai entered Saigon to rule Vietnam. He had been installed by the French.
1951 - U.N. troops seized Pyongyang, North Korea.
1956 - The last British troops leave the Suez Canal Zone in Egypt.
1966 - The landmark "Miranda v. Arizona" decision was issued by the U.S. Supreme Court. The decision ruled that criminal suspects had to be informed of their constitutional rights before being questioned by police.
1967 - Solicitor General Thurgood Marshall was nominated by President Lyndon B. Johnson to become the first black justice on the U.S. Supreme Court.
1979 - Sioux Indians were awarded $105 million in compensation for the U.S. seizure in 1877 of their Black Hills in South Dakota.
1983 - The unmanned U.S. space probe Pioneer 10 became the first spacecraft to leave the solar system. It was launched in March 1972. The first up-close images of the planet Jupiter were provided by Pioneer 10.