Associated Press

On July 16, 1790, a site along the Potomac River was designated the permanent seat of the U.S. government; the area became Washington, D.C.

In 1945, the United States exploded its first experimental atomic bomb in the desert of Alamogordo, New Mexico.

In 1951, the novel “The Catcher in the Rye” by J.D. Salinger was first published by Little, Brown and Co.

In 1969, Apollo 11 blasted off from Cape Kennedy in Florida on the first manned mission to the surface of the moon.

In 1980, former California Gov. Ronald Reagan won the Republican presidential nomination at the party’s convention in Detroit.

In 2016, Republican presidential nominee-apparent Donald Trump formally introduced his running mate, Mike Pence, during an event in New York.