Is Brexit the beginning of the end for international cooperation?

It’s official: Britain is done with Europe.

Prime Minister Theresa May has formally triggered the process for withdrawing from the European Union, ensuring that the United Kingdom, one of the largest and most prosperous countries in the EU, will soon leave the 28-member bloc.

While the process could drag on for two years or more, the Brexit decision serves as a historic and stinging rebuke to proponents of a unified Europe. Perhaps more importantly, it calls into question the very future of the EU.

Pro-Europe commentators, on both sides of the Atlantic, have argued that Brexit is a historical