On this day in 1939, Britain, France, Australia and New Zealand declared war on Germany after its invasion of Poland on Sept. 1, marking the outbreak of World War II.
On this day in 1955, Armed Forces Day was first observed in memory of the contributions of military servicemen during the eight-year Sino-Japanese War, which ended with the Japanese surrender on Sept. 3, 1945.
On this day in 1977, Sadaharu Oh, a famous ethnic Chinese baseball player in Japan, slugged his 756th homer, setting a new world record.