The cold war policy that if one country falls to communism neighboring countries might fall next was called a.) domino theory b.) plate tectonics appeasements d.) detente

The correct answer is A.

The domino theory was a Cold War policy. It was prominent from the 1950s to 1980s. It compared neighboring countries to perfectly aligned rows of domino, meaning that if the first country falls to communism the second  follows as well,  and then the third, the fourth etc. It is called the domino effect and it was one of the main arguments used to justify American military involvement in the Vietnam War because of Vietnam's proximity to Corea.

most people were factory or company owners.

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.