What was one result of these regional differences? A) Cities in the South emerged as centers for textile mills.
B) Slavery increased in the North as industrialization expanded.
C) Immigrants settled in the Midwest to establish small farms
D) Plantation systems in the South were replaced by large businesses.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

general allotment act (dawes act) february 8, 1887

amendment to the dawes act, february 28, 1891

commission to the five civilized tribes (dawes commission), march 3, 1893