When Germen u-boats were told to shoot any vessels crossing the Atlantic Ocean wich u.s boats were shot.So they got angry and declared war against Germany.
1917-1918
World war 1 and 2
At the beginning of the war the US did... absolutely nothing, refusing to get invovled in Europe's affairs.
Japan bombed Pearl Harbor --- Uh, that was WW2. WW1 was entered because of relationships with Britain, and the sinking of the Lusitania (which had US passengers.)
the U.s Played None. They Were Nuetral Because they were the ones Sending Weapons and Supplies. Therefore they Eventually Got invovled.
Germany fought the us in world war 1
The US helped France in world war 1 with submarines in the Atlantic.
world war one affect the us they had get a alot of money
in a world war 1 on the us ecompny all the american are died and and war is started 1941 to 1954 the american is won the war by us economy
Germany
japan
The US did enter World War 1, though not till 1917.