1801 Napoleonic Wars: The British led by Horatio Nelson destroy the Danish fleet in the naval Battle of Copenhagen.
1912 Titanic undergoes sea trials under its own power.
1917 US President Woodrow Wilson asks Congress to declare war against Germany.
1935 Scottish physicist Robert Watson-Watt receives a British patent for RADAR.
1942 USS Hornet with Jimmy Doolittles B-25 departs from San Francisco.
1982 Several thousand Argentine troops seize the Falkland (Malvinas) Islands from Great Britain.
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