April 2, 1513. Spanish explorer Ponce De Leon sighted Florida and claimed it for Spain. His landing site is now present day St. Augustine - the oldest city in the continental United States.
April 2, 1792. Congress established the first U.S. Mint in the city of Philadelphia.
April 4, 1949. NATO (the North Atlantic Treaty Organization) was created with the signing of a treaty by twelve nations united for common military defense against the threat of expansion by Soviet Russia into Western Europe.