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Vietnam War

Problem

“It is important to United States security interests that all practicable measures be taken to prevent further communist expansion in Southeast Asia. Indo-China is a key area of Southeast Asia and is under immediate threat. The neighboring countries of Thailand and Burma could be expected to fall under Communist domination if a Communist-dominated government controlled Indo-China. The balance of Southeast Asia would then be in grave hazard.”
-Source: Draft Report by the National Security Council, 1950
Which of the following developments in the 1960s best represented the continuation of the ideas expressed in the passage?
Choose 1 answer: