1500 - Portuguese navigator Pedro Alvares Cabral discovered Brazil.
1509 - Henry VIII ascended to the throne of England upon the death of his father Henry VII.
1864 - The U.S. Congress mandated that all coins minted as U.S. currency bear the inscription “In God We Trust”.
1889 - At noon, the Oklahoma land rush officially started as thousands of Americans raced for new, unclaimed land.
1915 - At the Second Battle Ypres the Germans became the first country to use poison gas.
1915 - The New York Yankees wore pinstripes and the hat-in-the-ring logo for the first time.
1952 - An atomic test conducted in Nevada was the first nuclear explosion shown on live network television.
1970 - The first “Earth Day” was observed by millions of Americans.
1976 - Barbara Walters became first female nightly network news anchor.
1987 - The American Physical Society said that the “Star Wars” missile system was “highly questionable” and would take ten years to research.