When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Contributors use data gathered by the Teaching, Research, and International Policy (TRIP) Project over a fifteen-year period. Ryan Powers is an assistant professor of international affairs at the University of Georgia's School of Public and International Affairs.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.