“Albanians in Kosovo are not people.”
I think this is where you are going wrong.
People cannot be forced under a government the majority do not want. Whatever the birthrates, or other arguments. Once the population majority has changed, it is too late, and that applies in California, same as Kosova.
Of course, one could use force of arms to ethnically cleanse an area, to bring the population back to the ethnicity desired, but they would be war crimes etc.
Game over.
So you would support the secession of SoC to Mexico if it were to come to that? Ok, you do that, the rest of us won’t roll over and play dead.
Please ead some mid 1860s American history!