What were some of the reasons that the united states became involved in the vietnam war?

The US involved themselves in the Vietnam war to stop the spread of communism

The social difference that caused sectionalism in the antebellum era would be c.)  north was disorganized. the north had slow population growth, where as the south had mass immigration.hope this really mark

It is c because it shows how the author is stating their own oppinion about the protagonist