Which statement best describes the domino theory
a. communism must be stopped domestically using pro-democracy propaganda
b. wars can be won only with multiple battle fields
c. if the united states spread democracy to one nation it would spread to other nations
d. a communist victory in one country could lead to the spread of communism to other country

D

Explanation:

After the second World War, and the splitting of Germany, the threat of communist expansion, especially in Korea and later Vietnam and nearby countries caused the development of domino theory in American geopolitics to justify international involvement, in order to halt the process early.

c

explanation:

c

impeachment is when a president is committing treason or doing shading acts while in presidendcy therfor he can be impeached   by congress