I believe the answer is: grew rapidly as people moved to urban centers looking for work
Between 1790 and 1900s, industrial revolution start to spread in America. This lead to the creation of many factories intended for mass production in urban centres. These factories provided many job opportunities that attracted many people from different background to move to urban centers and try their luck there.
<span>Between 1790 and 1900 American cities expanded steadily. The Industrial Revolution brought new products and opportunities to learn new skills to the common citizen. People left their farms and moved to cities with the hope of improving their standards of living.</span>
