Since the end of the Cold War,
the United States has been chiefly
involved in conflicts in?

The Cold War led to conflict because the world's two chief powers did not trust each other and were committed to opposing the other side's way of life. ... The Cold War was mostly a tension between these worldviews. There were also immediate conflicts and pressure points as the Cold War began

Explanation:

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

because mexico wanted to choose a centralized location