Ralph Peters takes a brief tour of foreign policy issues that could pose a challenge to America in the next four years.
It is a good list. I'd add Eritrea who may spark war with Ethiopia or escalate in Somalia, the Taiwan Strait if China attacks Taiwan, China elsewhere (perhaps the South China Sea), Zimbabwe imploding, Nigeria fracturing, Cuba imploding, Egypt in chaos or revolt, and of course, some damn thing in the Balkans that Russia decides requires Slavic solidarity. Also, while Ukraine is a potential target for Russia as Peters notes, I'd guess Belosrus as a more likely first target for anschluss.
Some may think that our problems stem from others hating us. But the next president will find that plenty of hatreds in the world roll along just fine without any push from America.