Which of the following accurately summarizes the involvement of the United States in world war I?
A. initially, the us was politically neutral and completely uninvolved however, once it joined the central powers they helped force Germany to surrender
B. initially, the u.s. was politically neutral and was involved only economically; however, once the u.s. entered the war its military involvement helped force an armistice
C. the u.s. joined the allied forces in 1914, but did not send troops until 1917, which eventually forced Germany to surrender
D. the u.s. was involves economically, which provided critical resources for allied forces and central powers that forces a German armistice