As far as drilling in the pristine wilderness areas is concerned, the animals might get contaminated. Meanwhile, since the late 50's the Alaskan Pipeline continues to transmit oil to Kalifornica where it is loaded onto ships bound for Asia. Not a barrel of that is refined and used in America.
Oil is fungible.
It is cheaper to sell Alaskan oil to Asia to buy oil from sources that can ship easier to East coast and Gulf of Mexico refineries, basically a swap.