I disagree. The US already fought a war to dtermine whether or not states may succede from the Union.
They can’t.
There will always be people (nutty people) who would want to break away from the greatest nation on earth. The vast majority will not want to do this.
Serbia, through ethnic cleansing, and other crimes against humanity, sowed the seeds for the loss of Kosovo. In short, screw them.
The Albanian population grew under Serb rule so it was not an ethnic cleansing but a thriving. Those in Serbia proper had a special tax applied to them for funds sent down to Kosovo.
And yes, when the ethnic Mexicans increase their population by leaps and bounds and become the majority in large parts they may try to get independence. There are already crimes and abuses against Americans in Mexican dominated territories.
As for ethnic cleansing - that is nonsense. Muslim terrorists killing Servs - Serbs had to protect themselves. If you want to bring up ethnic cleansing, what about our treatment of Indians?
Clinton killed over 3,000 Serbs - mostly WOMEN and CHILDREN - who had done us no harm and posed no threat to us. That was outrageous and nothing can excuse it.