The nuclear weapons that the super power countries had caused international tensions after World War 2. This caused the Cold war between the US and Russia.
The US and the Allies won the war and the US gained control of the Philippines, causing it to become a world power.
do you mean what caused us entry into world war one? if so then the sinking of the USS Lusitania by German u-boats was what caused American entry into the war
Gremany
US wanted to trade with the other countries causing them to get involved in the war
the sinking of the ship lusitania:)
The immediate cause was Japan's attack on Pearl Harbor. This caused the US to declare war on Japan, which led to Germany and Italy declaring war on the US.
when japan bombed hawaii that was the outrage that causedus to bomb them and then the us broke into world war 1 between japan and usa so suck it
Pearl harbor.
it caused the economy to go down
World War II
Europe needed help and weapons