England - just after US declared an independence.
The First Barbary War
Germany declared war on the US, the US then declared war on Germany.
Once the war was declared the first action by the United States was to deploy its military.
The US declared war on Japan. Germany also declared war on the US, and the US declared war in return
On December 11, 1941, Germany declared war on the United States. Then later that day the United States Declared War on Germany in response.
The USS Maine sank before the US declared war on Spain.
I don't think that the US declared war on Germany. Germany declared war on the US on December 11th 1941
The Italians declared war on the US on December 11, 1941, along with their German allies.
The last US declared war was WWII.
The US declared war on Germany on December 11, 1941 in response to Germany's declaration of war on the US earlier that day. In a separate act on the same day, the US declared war on Italy, which had also declared war on the US. Germany and Italy declared war on the US in response to the US declaration of war on their ally Japan on December 8, 1941 in response to the Pearl Harbor attack.
The US Civil War was an un-declared war.
The US did enter into an undeclared shooting war with Germany in the fall of 1941 because Germany has declared war on the US.