America wanted to help stop communism from spreading all over the world so they tried to help Vietnam by keeping south Vietnam a non communist government.
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The power to tax and spend for the defense and welfare of the United States, borrow money, regulate commerce with other nations and between the states, coin money, establish laws of naturalization (how people become citizens) , punish counterfeiters of money and securities, establish post offices and roads, - Examples of Expressed Powers of The U.S. Congress (there is more way more examples I could give you if you want)
