A sublayer from migration routes for the five largest refugee populations in modern US history. This layer focuses on the five largest refugee origin countries from 1951 to 2015: 1. Afghanistan; 2. Syrian Arab Republic; 3. Iraq; 4. Ethiopia; 5. Somalia. Source data: “Population Statistics.” The UN Refugee Agency, http://popstats.unhcr.org/en/persons_of_concern. Accessed 7 June 2016.
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