Answered

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

the Mexican-American War

the Louisiana Purchase

the Spanish-American War

the Russo-Japanese War

Verified Answer :

It was 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.