A strong middle class grew during the period of industrialization

Explanation:

While the growth of factories is keep rising, people started to think about their own business instead of rely on the government, which increased capitalism, and drew the emergence of the new middle class. ... Those who were rich landlords and factory owners keep their wealthy and became upper middle class (Lobley).

they are best known for the cliff pueblos found throughout arizona, new mexico, colorado and utah. and for their development of desert farming.

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missouri compromise of 1820 which prohibited slavery