The thing is thought: the natives don't even have the numerical superiority for that, and the numbers of natives militant enough wouldn't make them any more than bandits. Assimilation would be a factor and many would have accepted the rule of Washington or Ontario. A radical fringe wouldn't possess the fire power or ability to properly do it.

As with the incident of Wounded Knee in 1978 the conflict would ultimately come down to the Marshals service after some quick legislation is passed permitting them to utilize the resources necessary to clamp down on the radicals. But the last great ditch era of Native Uprising ended a century ago. The memories of Geronimo and the last great defenders of the old way are done. The White Man won, and they know exactly where they all are.

Beyond that, this is the perpetuation of the joke that the US needs to be torn apart. This joke died long ago. And it won't be permitted again.

A radical movement such as that would only really dawn in instances of severe civil rights abuses or the fervor of large-scale civil rights movement inspiring hard-line radicals to rise up. But they wouldn't be large enough still to be effective at anything.