Only congress can declare war, not even the President has this power.
US Civil War & Vietnam War.
1917
Well, in WWII, America was an ally with France so they didn't declare war on France. Although America didn't start war on Italy (one of their enemies in WWII), because America didn't want to join the war. They thought it was too dangerous.
Attack on Pearl Harbor.
In the United States government, Congress has the power to declare war on other nations.
The USA did not have to declare war on Germany because Adolf Hitler declared war on the USA.
US Civil War & Vietnam War.
1917
Well, in WWII, America was an ally with France so they didn't declare war on France. Although America didn't start war on Italy (one of their enemies in WWII), because America didn't want to join the war. They thought it was too dangerous.
Attack on Pearl Harbor.
Japan. Then Germany declared war on the US.
In the United States government, Congress has the power to declare war on other nations.
America declared war after Pearl Harbor, Hawaii was bombed.
Congress declared war on 13 May1846 but by then the war had been going on for three months.
An atomic power can't declare war, that would imply using nukes. The last time the US declared war was in WWII. And nukes didn't exist then.
No. What possible reason would Britain have had for that?
Declaring war on the USA after Japan declared war on America. Germany declared war on America hoping Japan would declare war on Russia. Since Japan did not declare war on Russia (Russia would later declare war on Japan), Germany did not have to declare on America. If Germany had not declared war on the USA, America would have difficulty in declaring war on Germany (although USA and Germany naval vessels in the North Atlantic were shooting at one another in 1941). If Germany had not declared war on the USA, then Hitler would not have had to face the military men and equipment of America. Although Russia fought the majority of land battles against Germany, it was American men and equipment that helped Russia and Britain and other Allied nations to defeat Germany.