On this day in History - July 27

1778 – American Revolution: First Battle of Ushant: British and French fleets fight to a standoff.

1866 – The first permanent transatlantic telegraph cable is successfully completed, stretching from Valentia Island, Ireland, to Heart's Content, Newfoundland.

1890 – Vincent van Gogh shoots himself and dies two days later.

1919 – The Chicago Race Riot erupts after a racial incident occurred on a South Side beach, leading to 38 fatalities and 537 injuries over a five-day period.

1921 – Researchers at the University of Toronto, led by biochemist Frederick Banting, prove that the hormone insulin regulates blood sugar.