In the 1950s, people began to migrate to the Sun Belt states, which were mostly in the a)northeast and southeast b)northwest and southwest c)northeast and northwest d) southeast and southwest

  d) southeast and southwest

Explanation:

  The Sun Belt is a region of the United States generally considered to stretch across the Southeast and Southwest.The advent of air conditioning created more comfortable summer conditions and allowed more manufacturing and industry to locate in the sunbelt. The Sun Belt comprises the southern tier of the United States, including the states of Alabama, Arizona, Florida, Georgia, Louisiana, Mississippi, New Mexico, South Carolina, Texas, roughly two-thirds of California (up to Greater Sacramento), and parts of North Carolina, Nevada, and Utah.

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.