Data Sources
1. Border Established .Internation Boundry Study, 1970, https://fall.fsulawrc.com/collection/LimitsinSeas/IBS105.pdf
2. Border Length. The World Factbook, 2021, https://www.cia.gov/the-world-factbook/countries/congo-republic-of-the/
3. Populations. City Population, https://www.citypopulation.de/en/angola/admin/
4. Capital city populations. https://www.citypopulation.de/en/angola/admin/