Me answer these questions with this thx.

1. US troops fought the war in the country of Vietnam. 1965-1975.

2. The US intervened twice in Lebanon. In 1958 and in 1982. 

3. WW2 ended in 1945. 5 years after WW2, the US became involved in a conflict. It was in Korea and lasted 3 years.

4. The US was in Vietnam in 1965 and Lebanon in 1958.

5. The Soviet Union was involved in a border war in 1968 with China. The Soviet Union was also involve in conflict with Czechoslovakia.

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