18th » Opening of the first German National Assembly (Frankfurt Parliament named Nationalversammlung) in Frankfurt, Germany.
19th » Mexican–American War: Mexico ratifies the Treaty of Guadalupe Hidalgo thus ending the war and ceding California, Nevada, Utah and parts of four other modern-day U.S. states to the United States for US$15 million.
22nd » History of Martinique 1815-1899 or Slavery is abolished in Martinique.
29th » Wisconsin is admitted as the 30th U.S. state.
Famous Birthdays on May in 1848
1st » Adelsteen Normann, Norwegian painter (d. 1919)
6th » Henry Edward Armstrong, English chemist (d. 1937)
15th » Viktor Vasnetsov, Russian painter (d. 1926)