Question

What event involving the United States brought about the need or desire to begin an expansionist policy with regard to foreign affairs

Answer 1

The correct option is: "the Mexican-American War"

Step-by-step explanation:

It was the the Mexican-American War that brought about the need or desire to begin an expansionist policy with regard to foreign affairs, since the end of this war ceded a lot of new territory that was used by settlers moving west.