America has remained highly engaged in global affairs throughout decades of growing energy dependency, so it's hard to imagine it would disengage if its quest for energy self-sufficiency failed - especially amidst a world of heightened resource competition.
I have long argued that, if China and the United States were interested in pursuing a strategic partnership, Africa is the best place to start, as neither enters the situation with past colonial baggage, and both possess interests that are quite complementary.
Once Europe's colonial empires were sent into deep decline, thanks to World War II, America became globalization's primary replicating force, integrating Asia into its low-end production networks across the second half of the twentieth century - just like Europe had integrated the U.S. before.
China's headlong rush to industrialize was pursued with the most Marxist of prejudices - bending nature to man's will. That's a desperately hard trick to pull off when one fifth of humanity, having previously subsisted on 7 percent of the world's freshwater supply, decides that it wants to instantaneously increase its caloric intake.