Answer:
Disease and starvation
Explanation:
Most contemporary historians estimate that between 9.4 and 12 million Africans arrived in the New World. Disease and starvation due to the length of the passage were the main contributors to the death toll with amoebic dysentery and scurvy causing the majority of deaths.
Abolitionist wanted to end slavery so it should be the second option, hope that helps
Neither side of the fight could advance due to the military prowess of the other
You didn’t include a pic for your question
It is the last one they both served in the Mexican-American war