First was the war of 1812, last was WW2.
Austria-Hungary, declared war on Serbia
Once the war was declared the first action by the United States was to deploy its military.
The first declaration of war was on July 28th, 1914, when Austria-Hungary declared war on Serbia.
After Japan bombed Pearl Harbor we declared war on them. Germany was an ally of Japan so they declared war on us. Italy was an ally of Germany so they went along with Germany and declared war.
First was the war of 1812, last was WW2.
Austria-Hungary, declared war on Serbia
The First Barbary War
World War I:When Great Britain declared war on Germany on August 4th, 1914 Canada's status as subservient to Great Britain meant that it too was now at war.World War II:Britain declared war on Germany after the German invasion of Poland on September 1st, 1939. Canada followed suit, one week after Great Britain, on the tenth of the month.
Once the war was declared the first action by the United States was to deploy its military.
England - just after US declared an independence.
Russia was bound by treaty with Serbia, Montenegro declared war on Austria-Hungary. Germany declared war on Russia. France bound by treaty with Russia declared war on Germany, Great Britain declared war on Germany after Germany refused to respect the neutrality and sovereignty of Belgium. United states tried to stay neutral but were to threatned by Germany's submarine attacks on Trade vessels to Germany's enemies. Japan had a military agreement with Britan, so declared war on Germany.
On December 11, 1941, Germany declared war on the United States. Then later that day the United States Declared War on Germany in response.
France entered WWII because of a defensive pact woth Poland. Because Germany declared War on Poland, France declared war on Germany. If Germany had declared war on France first, then Poland would have declared war on germany. -Feewet
World War I was directly started by the assassination of Austria's Archduke Franz-Ferdinand by a Serbian terrorist group. Austria-Hungary declared war on Serbia first.
The Austrian-Hungarians were first to declare war with the Serbs.
The pope at that time declared war