who did u.s. fight against in ww1?
United Kingdom Australia Italy Russia France
entailment
 The American victory was an enormous morale boost to the fledgling nation . More important , it convinced France to enter the war in alliance with the United States , openly providing money , soldiers , and munitions , as well fighting a naval war worldwide against Britain . 

entailment
 At first effectively neutral during World War II while Germany conquered much of continental Europe , the United States began supplying material to the Allies in March 1941 through the Lend @-@ Lease program . On December 7 , 1941 , the Empire of Japan launched a surprise attack on Pearl Harbor , prompting the United States to join the Allies against the Axis powers . During the war , the United States was referred as one of the " Four Policemen " of Allies power who met to plan the postwar world , along with Britain , the Soviet Union and China . Though the nation lost more than 400 @,@ 000 soldiers , it emerged relatively undamaged from the war with even greater economic and military influence . 

entailment
 Hoping to contain Germany , the United Kingdom , France and Italy formed the Stresa Front ; however , in June 1935 , the United Kingdom made an independent naval agreement with Germany , easing prior restrictions . The Soviet Union , concerned by Germany 's goals of capturing vast areas of eastern Europe , drafted a treaty of mutual assistance with France . Before taking effect though , the Franco @-@ Soviet pact was required to go through the bureaucracy of the League of Nations , which rendered it essentially toothless . The United States , concerned with events in Europe and Asia , passed the Neutrality Act in August of the same year . 

neutral
 = = = Rapprochement , Axis and World War II ( 1920 – 1945 ) = = = 

entailment
 World War I , in which the United States and its allies fought - among other Central Powers - the German Empire , raised concern about the German threat to the United States . The Espionage Act of 1917 and the Sedition Act of 1918 were passed in response . 
