Answer:
Before this event, the United States had not declared war.
Explanation:
Populism was important because it had a non-class outlook.
It was B. border dispute with Mexico
Mixed nations and borders. You can use the question itself to get the answer, since imperialism left such a strong legacy in africa, the borders were so defined and the natives were forced to abide by them. So there is no reason for there to be any confusion about what is where.