Excellent point, and I agree up to a point.
The first question is by far the more interesting one: secession.
Let's all recall our Jr. High history: the states of the Confederacy all voted to secede. Could that happen today? If it could then a second Civil War might well be avoided.
There is no moral issue approaching Slavery to galvanize one group to start killing the other. Events like the Brexit vote (and many others over the year, including multiple votes on French Canadian separatism, votes on Puerto Rican separation, etc.) have changed the way people think about these things.
I have long held that the first state to secede (if any do) will be Hawaii.
Hawaii has the strongest case for secession.
Imagine our current administration, or one much like it, being confronted with a "Petition for Restoration of Independence". It would push all the libtard buttons! A discriminated minority! INDIANS!! Actual "Colonialism"! Not mention "Imperialism" and "Capitalism" as historic facts. Bitter clinging "Military Industrial Complex" bitterly clinging to their "guns and Naval bases".
It is inconceivable that a Left dominated FedGov would fail to grant such an application. And it's highly likely that even a GOP government would eventually accede to those demands, perhaps after getting a few long term military leases.
I have long thought that this is the most likely, and perhaps only, scenario in which secession is likely to occur.
Well, just as an aside, there were many Indian nations alive and thriving when the settlers arrived. History portrays that poorly. But kingdoms rise and kingdoms fall at the whim of powerful forces.
Look what unfettered immigration did for them.