Which of the following best describes the "domino theory," which was used as a justification for US involvement in Vietnam?
If the US can defeat one Communist country, it can defeat all of them.
If one section of a country is taken over, the rest of the country will also fall.
If an aggressor nation invades one country successfully, it will invade another.
If a country falls to Communism, then its neighbors are also likely to do so.
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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.