Once the united states entered world war i, its navy played a key role by

The United States Navy began it's participation in WWI on April 6, 1917. This happened inmediatly after the declaration of war on the German Empire, after more than two years and a half of president Woodrow Wilson trying to keep the US out of the war.

The main focus of the US Navy was to convoy supplies and men to France and Italy, and to counter-attack enemy U-Boats in the Atlantic and Mediterranean seas. U-Boat stands for 'Unterseeboot' which literally means 'Undersea Boat'.

Very few decisive submarine maneuvers took place because of the US late entry to WWI, and the main ships from the navy never really engaged the German Empire fleet.

Have a great day!

what the first or next guy says

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation: