The Grand Union Flag flew for the first time with the commissioning of the USS Alfred.
Amateur British chemist Sir James Jay invented invisible ink.
The United States Marine Corps was founded when two battalions of Continental Marines came together in Philadelphia, Pennsylvania.
Lord Dunmore promised freedom to every slave who enlisted into the British Army.
African-American poet Phillis Wheatley was freed from slavery.
The US Postal Service was founded.
The Battle of Lexington and Concord began, which kicked off the American Revolutionary War between 1775 & 1783.
The first Jewish person was elected in the US.
