The Western Hemisphere Travel Initiative (WHTI) is the policy directive of the Department of Homeland Security following the Intelligence Reform and Prevention Act of 2004. It will require that all citizens, including American citizens as well as foreign nationals, entering the United States from any foreign country to show documentation demonstrating identification and citizenship.
Hundley, James, "The Anticipated Impacts of the Western Hemisphere Travel Initiative on Coast Salish Communities" (2009). Border Policy Research Institute Publications. 59.