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review the maps above. which of the following best describes how the population of cities changed from 1820 to 1860?

in 1860, there were no cities with over one million people.
by 1860, many cities in the midwest had over 250,000 people.
from 1820 to 1860, the number of cities with over 10,000 people increased.
in the 40 years following 1820, the number of cities with over one million people decreased.

From 1820 to 1860, the number of cities with over 10,000 people increased.

Explanation:

This is the answer that best explains the changes that took place from 1820 to 1860 as recorded in this map. In 1820, we can see around a dozen cities with a population of over 10,000 people. This was a significant population at the time. However, we can see that by the 1860s, the number of cities with this population had greatly increased. This was most likely a consequence of immigration and industrialization.

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