All the states admitted to the union with one notable exception were territories controlled by the United States, and all were dominated by American citizens. These populations had nowhere else to go. Do you honestly think that Idaho was going to join Canada, or strike out on its own? Of course not.

The idea that people would have a primary allegiance to their state absolutely did not pan out. No one puts South Dakotan at the center of their identity in 2017, but in the late 18th century they certainly did. For evidence look at how many signers and organizers of the revolution failed to bother to show up to the constitutional convention. There was no United States or national identity at the time. At best, it was like claiming to be a citizen of the European Union today.