The US has enormous hydrocarbon reserves, and they have been adding technically recoverable reserves at an astonishing rate. Given current crude oil production rates and reserve estimates, the US could likely keep up the current pace into the 22nd century -- so very sustainable. And that ignores the mindbogglingly large natural gas and coal reserves in the US (effectively unlimited), which can also be used for the same purposes as crude oil albeit at higher cost.
Realistically, that is more than we're ever likely to need given the ongoing electrification of transportation. It doesn't make sense to "save it" for the future and US crude oil has the advantage that they do not need the profit margins that would allow them to prop up a country with it.