it seems to be from my interpretation of history that empires fall shortly after a push for expansion. rome, japan, germany, britain, all held big empires for a time, only to have them collapse. most of the time a sensable state is formed as the nation turnis its attention inwards to its own problems (the exception being rome, which became a religious empire instead). i see it as an essential part of a country's maturation. while all the countries i mention have grown up to a degree, the us is still an angsty adolescent, waiting to be whipped into adulthood. the power vaccume will allow another country to take its palace as world power (china is looking to take that spot). hopefully one buy one nations will go through this process and in the end create a world thats fairly stable. assuming somone doesnt decide to launch a bunch of nukes in the process.