Which justification did U. S. officials give for sending troops to aid an unpopular government in Vietnam? stopping ethnic cleansing in Cambodia protecting American business interests preventing the spread of communism defending civilians against human rights violations

Preventing the spread of communism

Explanation:

The role of the united state in Vietnam war began after the world warII. US mission was to restrict the communist domination that was present in Vietnam government, this was because communism could easily spread to the Neighbouring countries which would result to a change in the balance of power throughout Southeast Asia.

the answer to your question is:

strong-mayor system

the communist manifesto is an 1848 political pamphlet by the german near the end of the manifesto, the authors call for a "forcible overthrow of all existing social conditions",  ..