In 1788, Massachusetts ratified the federal Constitution, the sixth state to do so.
In 1819, Singapore was founded with the establishment of a British East India Company trading post.
In 1865, Gen. Robert E. Lee was appointed commander in chief of the armies of the Confederacy.
In 1933, the 20th Amendment, changing the dates of terms of some federal offices, to the U.S. Constitution went into effect.
In 1943, U.S. Army Gen. Dwight D. Eisenhower was named commander of Allied expeditionary forces in North Africa. He later became World War II Supreme Allied Commander in Europe.
In 1952, Princess Elizabeth became sovereign of Great Britain upon the death of her father, King George VI. She was crowned Queen Elizabeth II on June 2, 1953.
In 1987, broad no-smoking rules took effect for 890,000 employees in 6,800 U.S. federal buildings nationwide.
In 1992, a military transport plane crashed into a restaurant and hotel in Evansville, Ind., killing 16 people.
In 1993, U.N. Secretary-General Boutros Boutros-Ghali asked NATO for authority to order airstrikes against Serb artillery positions in Bosnia.
In 1997, the head of Mexico's leading anti-drug agency resigned after evidence emerged that he took bribes from a drug cartel.