Albert Einstein completed his doctoral thesis at the University of Zurich and was awarded a Ph.D.
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Louisiana became the 18th state to join the United States of America.
The USA signed The Louisiana Purchase in Paris.
The Queen knighted British Captain Tom Moore on his 100th birthday.
Adolf Hitler and his newlywed wife, Eva Braun, committed suicide in their bunker in Berlin, Germany.
The first Converse shoes were introduced.
