U. S. cities grew quickly during the early 1800s because:
O A. nativists called for more Americans to move to cities.
B. education became freely available in cities.
C. poor transportation made it difficult to leave cities.
O D. recent immigrants often had to live in cities.

recent immigrants often had to live in cities.

Explanation:

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

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