Explorer Juan Ponce de León found Florida and claimed it for Spain.
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The armies of Sultan Mehmed II arrived at Constantinople's outer walls and prepared to lay siege to the city.
The Coinage Act was enacted in the US.
Albert Einstein visited New York City and lectured on his Theory of Relativity for the first time.
The '2001: A Space Odyssey' sci-fi movie premiered in Washington, DC.
Sixty-six people died in Sverdlovsk, USSR, when a bio-warfare lab accidentally released airborne anthrax.
