On this day in 1910, the Japan–Korea Treaty of 1910, also known as the Japan–Korea Annexation Treaty, became effective, officially starting the period of Japanese rule in Korea.
On this day in 1911, Ishi, considered the last Native American to make contact with European Americans, emerged from the wilderness of northeastern California.
On this day in 1922, the first radio advertisement was broadcast on WEAF-AM in New York City.
And on this day in 2005, Hurricane Katrina devastated much of the US Gulf Coast from Louisiana to the Florida Panhandle, killing an estimated 1,836 people and causing over US$108 billion in damage.