The answer is the North Vietnamese took over the South Vietnam spreading communism Southward and this proved the domino theory (if one country come under the influence of communism, the surrounding countries would follow).
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B. To choose a party's candidate for a general election
The best option in terms of an accurate definition for economic development would be "<span>a. the level of economic, political, and social well being of a nation's people," since "developed" nations usually have more of these things than "undeveloped" nations.
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