Industrialization started in the United States in the 1820s.

Based on this fact, when was this picture of St. Louis created?
Before 1820
After 1820

The process in which people move from rural areas to cities is called.
urbanization
immigration
industrialization

Industrialization started in the United States in the 1820s.

Based on this fact, when was this picture of St. Louis created?  after 1820

The process in which people move from rural areas to cities is called: urbanization

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.