What has been the most significant population shift in the United States during the twentieth century?

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the growth of urban areasthe expansion of suburban communitiesmigration toward the Sun Belt regionreturning to rural 'old homestead' locations

Explanation

The most notable demographic change in the U.S. during the 1900s was the rapid increase in urban populations, known as urbanization, surpassing trends like suburban growth, Sun Belt migration, or rural resettlement.