Newswise — Lee Feinstein, dean of the Indiana University School of International Global and International Studies, served as U.S. ambassador to Poland in 2009 to 2012 and advised two secretaries of state and a secretary of defense. He can be reached at [email protected] or 812-856-7900.

"I think everybody knew it was going to be close, but the news was nonetheless a shock to everyone. It has immediate and longer-term economic consequences, but looking at this from the broader perspective, what it means is a setback for the effort that started after World War II to build a Europe whole and free," Feinstein said.

"The worst case scenario of this dis-union is the return of geopolitics to Europe. From the American perspective, the return of geopolitics to Europe -- the fracturing of Europe, the withdrawal from the EU of one its most powerful countries economically and its most militarily capable country, as well as a country that has a permanent seat on the UN Security Council -- is something that’s not good for the United States. The U.S. is stronger when it works with its allies and when its allies are united, and the United States has no stronger, more like-minded partners than its European friends."