If states could freely secede (and potentially re-join), can you imagine the political games that would be played along those lines? I mean if CA (or Texas or NY) threatened to Secede, given the vast scale of its economy (silicon valley particularly), can you imagine the political and economic favors that would be thrown its way in order to tempt it into not seceding? No, secession cannot be allowed. If you really hate the USA that much you're free to emigrate to another country.