United States might not be able to save its ally, South Vietnam, from its communist aggressors.
Popular Sovereignty is your answer.
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Answer:
D-Day was one of the most remarkable military campaigns in history. One of the strategies in Operation Overlord was to prepare the beaches for incoming allied troops by heavily bombing Nazi gun positions at the coast. As well as destroying key bridges and roads to cut off Germany's retreat and reinforcements. The paratroopers were told to then drop in to secure inland positions ahead of the land invasion.