The factor that was responsible for the change in population from 1860 to 1910 is The Civil War resulted in residents leaving the state.
This is the change in number if people in a particular state.
American urban population growth changed as a results of many factors during 1860 to 1910 but one of the main factor is large influx of immigrants to urban area.
Therefore, there was large influx of immigrants which change in population from 1860 to 1910.
Learn more about population growth at:
https://brainly.com/question/11651733