On this day in 1991, Rajiv Gandhi, former Indian Prime Minister was assassinated by a suicide bomber. The bomb exploded in a bouquet of flowers during election campaigning in the southern state of Tamil Nadu.  

In 1536, The Reformation was officially adopted in Geneva, Switzerland.

In 1688, The English poet Alexander Pope was born.

In 1840, New Zealand was declared a British colony.

In 1881, Clara Barton founded what became the American Red Cross.

In 1927, Charles Lindbergh became the first person to fly across the Atlantic Ocean (from New York to Paris) in his monoplane, The Spirit of St. Louis. The trip began May 20.

In 1934, Oskaloosa, IA, became the first city in the U.S. to fingerprint all of its citizens.

In 1956, The U.S. exploded the first airborne hydrogen bomb in the Pacific Ocean over Bikini Atoll.

In 1998, Indonesian President Suharto resigned.

In 2003, Christine Todd Whitman announced her resignation as administrator of the Environmental Protection Agency.