What helped break the stalemate in World War I and allowed the Allies to win World War I?

A. The assassination of
Archduke Franz Ferdinand

B. Entangling Alliances

C. A stalemate

D. American entry into the war

D.

Explanation:

The warring parties were exhausted, depleted of man power (entire generation of young men chewed up on both sides)

Infusion of fresh American troops, logistical support, etc. allowed the final push. American sector in Meuse-Argonne breached German railroad supply lines, cutting off resupply to their troops in France and Belgium.

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