Question

how did world war i change after the united states became involved?
a. the war was fought in
o mans land\ before the united states became involved. after the united states became involved, fighting moved to the trenches.
b. the war was fought mostly in russia before the united states became involved. after the united states became involved, fighting moved to france.
c. the war was a stalemate before the united states became involved. after the united states became involved, the balance tipped to the allied powers.
d. the war was fought with outdated weapons before the united states became involved. after the united states became involved, modern weapons were used

Explanation:

Before U.S. entry, WWI was a prolonged stalemate in Western Europe with trench warfare yielding minimal gains. The U.S. brought massive fresh troops, supplies, and financial support to the Allies, breaking the deadlock and shifting the military and economic balance decisively in favor of the Allied powers, leading to the eventual defeat of the Central Powers. Options A, B, and D are factually incorrect: trench warfare and No Man's Land existed before U.S. entry, major fighting was centered in France prior to U.S. involvement, and modern weapons like machine guns and tanks were already in use before 1917.

Answer:

C. The war was a stalemate before the United States became involved. After the United States became involved, the balance tipped to the Allied powers.