This table shows the percentage of the population who lived in urban areas between 1820 and 1870.
Decade Percentage
1820
7%
1830
9%
1840
11%
1850
15%
1860
20%
1870
26%
Source: U. S. Census Bureau
Which factor contributed MOST to the population changes shown in this table? (8.13B, 8.
A Western lands acquired by the United States had many urban areas.
B Industrialization encouraged people to find work in urban areas.
C Recurring droughts made farming a risky way of earning a living.
D Immigrants typically settled in rural areas of the country.