The only true statement about U.S. involvement in Southeast Asia is The United States called for the creation of the Southeast Asia Treaty Organization.
What did the U.S. do in Southeast Asia?
They supported the creation of the Southeast Asia Treaty Organization to foster peace in the region, but did not support H Chin Minh and his struggle for independence.
They also did not support the division of Vietnam even though they were present at the peace process because they did not want H Chin Minh winning the elections.
In conclusion, option B is true.
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