Ottawa Fury FC were part of the NASL division 1, but wanted out (and rightly so) into MLS. MLS wanted them in the 1st division (but not now - MLS was not ready for additional expansion yet) but there was some internal politics so they were allowed into MLS but had to agree to division 2 status (so they set themselves up as Montreal's team) . MLS has said if Ottawa Fury FC continue to perform well when it comes to expansion of division 1 they would get in at the point. But the MLS Division 1 doesn't want to expand too quickly (only so much money to go around and costs and so on)
If I had my way, NASL would simply merge with MLS and at that point North American footie would be ready to go global