The answer would be D. enslaved people in the rebelling states are free
Weather will be the primary reason. Despite its huge size. the real habitable area is probably less than 10% of its geographical size. Even Southern Ontario is deemed by many I know to be "too cold to live". 90% of Ontario and Quebec are simply inhabitable. I also personally think the entire Manitoba and Saskachewan are not suitable for human habitation unless we can create a way to simply hibernate during the 6 month winter (why there are so few people in Montana and North Dakota?) The fact that Montreal are thrive as a vibrant metropolis is already sort of a miracle and we don't see many such large cities with such severe weather. The only other case I can think of is probably Moscow.
Answer:
opposed left-leaning & socialist governments
"<span>c. because western territories were threatening secession" would be the best option, but the better reason was because he could see that the war was going to continue regardless of slavery's fate, and he hated it from the start.</span>