why nationalism is a threat world wide.

 We all know it the idea of an area becoming its own,independent nation.recently Scotland,my ancestral homeland,has begin moving toward independence.here in the u.s we see states trying to secede.this sounds like and ideal thing.everyone has a right to self government.but is it?
   lets look at history,when England and Scotland were separate nations,they fought constantly.when the confederacy declared independence,there was a war.so,does that mean war?not really.but look at the world picture.imagine if you will,no u.s.a,no great Brittan,no France,Spain.what`s left?a very powerful,unchallenged Russia,china.these nations could easily destroy the mini-nations that are left.and the probability of feudal states rises significantly.so.we would in essence,have to bow to Russia or china.and feudal warfare.it scares the crap out of me.and who is to say the nations that emerge will be better?and some will end up being dictatorships
    Scotland deserves self government.but at the same time,this is not the 1200`s and this is not the 1800`s.the threat is bigger than our differences.we can not allow this to divide us,and leave the world open and vulnerable to a Adolf Hitler.