The answer is A.)they reopened trade with the middle east during the 14th century.
B.) Border Ruffians.
Abolitionists didn't agree with slavery.
Free-Soilers were members of the Free-Soil party.
Slaveholders were just slave holders in the South. This is only wrong because they were the slaveholders in the South that stayed in the South.
Hope this helps! (:
Guerrilla warfare is basically 'Hit and Run' with a more sophisticated name. I'm not sure about why it was so successful in Vietnam, but I do know that Guerrilla warfare is very effective when executed properly, because there are very few casualties and a lot of damage is done to the enemy. It also works really well when the people using guerrilla warfare know the terrain well, because they would have an advantage over the enemy.
Hope this helps!