Or a counter explanation: 1. American colleges are still overwhelmingly the best in the world. https://en.wikipedia.org/wiki/Academic_Ranking_of_World_Univers

Or a counter explanation: 1. American colleges are still overwhelmingly the best in the world. https://en.wikipedia.org/wiki/Academic_Ranking_of_World_Universities https://en.wikipedia.org/wiki/Academic_Ranking_of_World_Univ... 2. 96% of students at American colleges are American. http://www.usnews.com/education/best-colleges/articles/2014/11/17/number-of-international-college-students-continues-to-climb http://www.usnews.com/education/best-colleges/articles/2014/...