Adolf Hitler and Benito Mussolini met in Salzburg, Austria.
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Spain and Portugal signed the Treaty of Saragossa.
The German army used chlorine gas for the first time.
Edward & Sarah Bishop and seven others were examined by Magistrates in Salem, Massachusetts, for witchcraft.
Twenty million Americans mobilized to call for greater protections for our planet. This became the world's first Earth Day.
Sir Robin Knox-Johnston completed the world's first non-stop, single-handed global circumnavigation.
