On this day:

1894 Nicholas II became Tsar of Russia, the last Tsar of Russia

1952 First large hydrogen bomb tested by the U.S. The bomb, codenamed Mike, was part of Operation Ivy

1993 Maastricht Treaty comes into force, creating a common currency for EU, the Euro

Born on this day:

1871 Stephen Crane, American journalist, author, poet

Gone on this day:

1972 Ezra Pound, American poet

2012 Agustín García Calvo, Spanish philosopher, poet