On July 21, 1861, a dry summer Sunday, Union and Confederate troops clashed outside Manassas, Virginia, in the first major engagement of the Civil War, the First Battle of Bull Run.

in 1899, Ernest Hemingway was born in Oak Park, Illinois.

In 1925, the so-called “Monkey Trial” ended in Dayton, Tennessee, with John T. Scopes found guilty of violating state law for teaching Darwin’s Theory of Evolution.

In 1954, the Geneva Conference concluded with accords dividing Vietnam into northern and southern entities.

In 1969, Apollo 11 astronauts Neil Armstrong and Edwin “Buzz” Aldrin blasted off from the moon aboard the lunar module for docking with the command module.

In 1980, draft registration began in the U.S. for 19- and 20-year-old men.

In 2011, the 30-year-old space shuttle program ended as Atlantis landed at Cape Canaveral, Florida.