Did most people leave the Southern Plains during the Dust Bowl years?

Roughly 2.5 million people left the Dust Bowl states—Texas, New Mexico, Colorado, Nebraska, Kansas and Oklahoma during the 1930s. It was one of the largest migrations in American history. Oklahoma alone lost 440,000 people to migration. Many of them, poverty-stricken, traveled west looking for work.

Explanation:

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.