Correct me if I'm wrong but I believe it was Sojurner Truth.
Answer:
demographics
Explanation:
The statistics about the human population fall into the category of the demography. The demography is part of the geographic sciences, more specifically of the socio-economic geography spectrum. The focus of the demography is the human population and its characteristics. In order to be able to have a proper data base, the demography is using statistics. Some of the things that this field is studying is ethic groups, racial groups, religious groups, birth rates and death rates, level of education, age structure, migratory patterns and many more.
Comparing source from other established sources from that time period
Explanation:
it's very easy and simple answer u can't do it
He described the elliptical orbits of the planets.
