Only half true, Gato. The USA has large RESERVES that will never run out. Access to these reserves is, however, RATE LIMITED. Due to diminishing returns on investment it's not viable to invest sufficiently to increase production. From a logistics & engineering perspective it's simply not possible to increase USA energy extraction. Doesn't matter how much is still in the ground.

USA started with a CONVENTIONAL oil endowment larger than that of Saudi Arabia. Now it's nearly gone. What's left is UNconventional oil to which access is highly rate-limited.