International migration affected regional relationships in the pre-Civil War period as most new arrivals were settling in the Northeast or Old Northwest, tying those regions socially and economically.
Answer: Option C
Explanation:
The colonies were following a capitalistic way of manufacturing goods and transporting them, which was not being followed in north east territories and north west territories, eventually affecting the economic system. The territories expanded into the southern part towards Mexico and slavery followed them along with the idea of free trade. So, concluding that International migration affected regional relationships in the pre-civil war period as most new arrivals were settling in the northeast or old northwest, tying those regions socially and economically.