These websites will generate data sets of population and other statistics to support or refute statements in your research paper.
https://pewglobal.org/
Pew global; trends, world data, articles around reports.
https://people-press.org/
Pew Research Center for the people and the press.
https://www.pollingreport.com/
Polling report from many sources, on many subjects.
More under Demographics / Census or Countries (World) topics.