ANSWER:
Crusades, military expeditions, beginning in the late 11th century, that were organized by western European Christians in response to centuries of Muslim wars of expansion. Their objectives were to check the spread of Islam, to retake control of the Holy Land in the eastern Mediterranean, to conquer pagan areas, and to recapture formerly Christian territories;
Explanation:

We need government because of following ways
- if the government is not there dictatorship is easily establish in our country.
- if government is not there , the rules are not followed by peoples
- if government is not there ,there is no one who work for the development of the country
- If government is not there criminal activities increased in countries and no one is there to handle . . The country filled with choas
The answer is C. After WW2 the Germans had to sign it.
Assuming your question is in reference to the Vietnam War, the United States got involved because of
<h2>domino theory and the policy of containment.</h2>
"Domino theory" was applied in justifying US involvement in the Vietnam War. Domino theory said that the spread of communism in Vietnam would result in other countries in the region falling like dominoes to the influence of communism.
Domino theory was a corollary to the overall policy of containment that developed as the United States' policy regarding communism after the end of World War II. George F. Kennan is known for recommending the policy of containment, which said that the best way to deal with the threat of communism was simply to try to keep it contained to the places where it already existed.