It led to the need to seek agricultural land to grow more food for Europeans.
It created a desire for more cultural exchanges among different racial groups.
The majority of American intervention in the foreign affairs occurred during the Cold War (this is your answer). Latin America was a frequent hotspot for activity as well especially towards the latter half of the Cold War with Fidel Castro's rise to power in Cuba.
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.