How did population shifts change American life during world war II

"The Southwest became a growing cultural, social, economic, and political force."

The correct answer is The Southwest became a growing cultural, social, economic, and political force

There was a lot of migration towards that area and the area started growing and developing more due to high amounts of new workers and those willing to open companies and factories in the area. After the war ended, they only continued developing since the period after ww2 was great for US economy.