Data Sources
1. Border Established. African Boundaries: A Legal and Diplomatic Encyclopaedia,1970,https://books.google.co.ug/books?redir_esc=y&id=A8Du4k0udx4C&q=algeria+tunisia#v=snippet&q=angola%20zambia&f=false
2. Border Length. The World Factbook, 2021, https://www.cia.gov/the-world-factbook/countries/angola/
3. Populations. City Population, https://www.citypopulation.de/en/angola/admin/
4. Capital City Populations. Districts of Zambia, http://www.statoids.com/yzm.html
- City Population, https://www.citypopulation.de/en/angola/admin/
- Districts of Zambia, http://www.statoids.com/yzm.html
5. Major Conflict Incidents . News Archival Search
6. Border closures. News Archival Search