As industry grew, the
population of the United
States shifted and grew.
Based on the graph, if the
total population in 1820 was
about 10 million, how many
of those people lived in
cities?

About seven hundred thousand people.

Explanation:

So many people lived in urban areas during the 1920s. Official figures show an increase in the number of people in urban centres throughout the nineteenth century. Thus, in the 1950s, about 15% of the total population lived in cities. The reason for this is the fact that the process of industrialization did not happen "overnight" but developed throughout the century.

a. the astrolabe could determine the correct latitudinal location of the ship