The United States declared war on Germany (then, later, Austrian-Hungary) in 1917 for several reasons. The most important was Germany's unrestricted submarine warfare campaign, which led to the loss of American goods and lives despite America's neutral status. Also involved was growing American sympathy for the Allied cause and growing distrust of Germany, in particular.
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The last declared US war was WW2.
you declare war
Germany didn't declare war on the US in world war 1. It was the US that declared war on Germany on April 6th 1917 as a result of the unrestricted submarine war introduced by Germany in January that year. - I Warner
England cannot declare war on the us because in 1937 they signed a treaty preventing each other from fighting. They also became alliances and in world war 2 the Americans helped the BBritish and french soilder's.
A true declaration of war can only be done by congress.