We do not face as daunting a problem in North America (at least in Canada and the United States) because the basic structure and philosophy of the regulatory frameworks governing commerce, labour, and financial markets are similar - though far from identical. So the job of harmonization at the national level will be somewhat less onerous than in Europe.
But it will still be a lengthy and difficult process. Furthermore, the problem for us is that, given the size and weight of the United States, reaping the benefits of harmonization will mean that, by and large, we would probably have to move towards U.S. regulatory standards.