1777

The Second Continental Congress approved the Articles of Confederation. 1806

Explorer Zebulon Pike sighted the mountain now known as Pikes Peak in present-day Colorado.

1939

President Franklin D. Roosevelt laid the cornerstone of the Jefferson Memorial in Washington, D.C.

1966

The spaceflight of Gemini 12, the final mission of NASA’s Gemini program, ended successfully as astronauts James A. Lovell and Edwin “Buzz” Aldrin Jr. splashed down in the Atlantic after spending four days in orbit.

1969

A quarter of a million protesters staged a peaceful demonstration in Washington against the Vietnam War.

— From wire reports