The United States entered the First World War after Congress declared war on the German Empire.
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10th December 1799: France adopts the metric system for weights and measures
10th December 2017
6th April 2019
6th April 1917: The USA declares war on Germany in WW1
11th November 1918: WW1 Armistice of Compiègne is signed
11th November 2018
9th November 1989: East Germany opens the Berlin Wall
9th November 2017