United States Geography
For the HiSET, Geography is the key to answering many questions about history. These websites will help you learn about the geography of the United States.
The thirteen colonies: https://www.history.com/topics/colonial-america/thirteen-colonies
Regions of the United States: https://education.nationalgeographic.org/resource/united-states-regions (Scroll down and read about Westward Expansion, Regional Economies, and Region)
State Abbreviations: https://www.faa.gov/air_traffic/publications/atpubs/cnt_html/appendix_a.html
State Capitals: https://www.50states.com/tools/thelist.htm
Major Cities in the United States: https://www.nationsonline.org/oneworld/most_pop_cities_usa.htm