President eisenhower believed in the domino theory as it applied to world politics wich held that

The domino theory was a theory during the Vietnam War. It meant that if Vietnam fell to communism, then it's closest neighbors would then follow. The United States was fighting against North Vietnam in order to prevent this from happening.

don't forget to make me the brainiest

answer; /// i believe that the correct answer is (d)the huang he river valley;

b. native americans them