The creation of Maine from Massachusetts shows that there is a way to redraw the borders of a state already admitted to the union. It may not be an efficient or repeatable process, but evidently it can happen regardless of how many times you say "states, not provinces!".
Wartime is a long-accepted way of changing what a government has sovereignty over. This is still a bad example to show that US states are mere administrative decisions permitted to exist because the feds feel nice today.
