The US has been energy independent for many years, now. But the bars on exporting oil and natural gas that were put in place in prior eras were lifted, so American consumers are now exposed to global pricing similar to when we were import dependent.
Plenty of famines in history where food was still being exported because the people suffering and the people profiting from exports weren't the same people.
This led to the famous observation that democracy prevents famines. So I guess the question is to what degree the US is a democracy.