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.

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its many islands, high mountains, and remote peninsulas isolated population centers.

        i'm fairly sure that the correct answers are 2 and 3.

        i used both my knowledge of world history and the process of elimination to obtain these answers. option 1 cannot be a possible selection because the mandate of heaven belongs to ancient chinese philosophical belief. option 4 sounds like it would benefit the region than detriment it. however, both 2 and 3 explain a potential reason for what could have contributed to the fall of the roman empire.

      hope this ! if i were you, i'd get a second opinion, because i haven't taken this course for a year. best of luck!

***websites that me understand the curriculum better last year are and ***