The Vietnam war proved that the state of global communism was strong in winning battles with regards to alliances. It showed that if communist countries coordinated with each other, they would be a very powerful and fearful bunch of countries.
I believe the answer is the first one, mainly because he did not wish to have the war come onto American soil.
Explanation:
He was a famous orator. In the hot-tempered times before the Civil War, he wanted to preserve the Union—even if that meant compromise. He thundered, "Slavery is wrong!" but to keep the southern states from seceding, he supported the Compromise of 1850 allowing slavery in new territories.
