September 15: Independence Day for Costa Rica, Guatemala, Honduras, Nicaragua and El Salvador ( 1821)

• 1644: Giovanni Battista Pamphili became Pope Innocent X.
• 1835: Aboard HMS Beagle, Charles Darwin reached the Galápagos Islands, where he began to develop his theories of evolution.
• 1916: Tanks, the "secret weapons" of the British Army during World War I, were first used in combat at the Battle of the Somme.
• 1935: Nazi Germany enacted the Nuremberg Laws, which deprived German Jews of citizenship, and adopted a new national flag emblazoned with a swastika.
• 1950: Korean war: U.S. armed forces landed at Incheon, Korea.

Recent days: September 14 – September 13 – September 12