Pyotr Ilyich Tchaikovsky composed his “Swan Lake” ballet.
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Michael Moorer claimed the heavyweight boxing title after smashing Evander Holyfield in Paradise, Nevada, US.
Twenty million Americans mobilized to call for greater protections for our planet. This became the world's first Earth Day.
The German army used chlorine gas for the first time.
Adolf Hitler and Benito Mussolini met in Salzburg, Austria.
The US Congress passed legislation that allowed the 'In God We Trust' inscription on the currency.
