In terms of the Mexican War, many of the opponents knew (and were right) that it was mainly just a war of conquest waged by President Polk for land, and that this land would most likely become slave territory, which many saw as a moral and inherent evil.
tbh it's been about a year since i studied this stuff in HS
so it is ether C or D but i think the best answer is D
Some are more desirable because every person has a personal preference that appeals to them and if it isn't appealing to them or if society likes one more, it would naturally draw the to it.
