A sino-American war is possible, maybe a second Korean war escalates when China refuses to let the USA move into North Korea. Forming the MEC is tough, maybe something like Iraq collapses and Iran + Syria invades. It's tougher then that, however, because Pakistan I believe was also apart of it, and we get into the Shia-Sunni conflict. But the MEC and China invading the USA? No way in hell.