312: Roman Emperor Constantine the Great is said to have received his famous Vision of the Cross

1795: Pinckney’s Treaty [Treaty of San Lorenzo] is signed by Spain and the US, establishing the southern boundary of the US and giving Americans the right to navigate the Mississippi River

1962: Black Saturday during the Cuban Missile Crisis: An American spy plane is shot down over Cuba and the navy drops warning depth charges on Soviet submarines

1982: China announces its population has exceeded one billion people

1986: British government deregulates financial markets in a “Big Bang,” enhancing London’s status as a financial capital and increasing income inequality

Source: Onthisday.com