Original Paper from the Costs of War Project:
https://watson.brown.edu/costsofwar/files/cow/imce/papers/2020/Displacement_Vine%20et%20al_Costs%20of%20War%202020%2009%2008.pdf
From The New York Times:
At Least 37 Million People Have Been Displaced by America’s War on Terror
A new report calculates the number of people who fled because of wars fought by the United States since Sept. 11, 2001.
https://www.nytimes.com/2020/09/08/magazine/displaced-war-on-terror.html