all countries - SERP Analysis

https://history.state.gov/countries/all

https://www.britannica.com/topic/list-of-countries-1993160

https://www.worldometers.info/geography/alphabetical-list-of-countries/

https://en.wikipedia.org/wiki/List_of_countries_and_dependencies_by_area

https://data.worldbank.org/country

https://www.mofa.go.jp/region/

https://www.nationsonline.org/oneworld/countries_of_the_world.htm

https://www.who.int/countries

https://www.cia.gov/the-world-factbook/countries/