[thackney]

The rest of our foreign oil comes in large part from this hemisphere, which is relatively secure.

That's rather misleading. Most of our imported oil comes from OPEC. Nigeria and Venezuela are hardly secure sources of oil for the US.

U.S. Crude Oil Imports by Country of Origin
http://tonto.eia.doe.gov/dnav/pet/pet_move_impcus_a2_nus_epc0_im0_mbblpd_m.htm

[#1CTYankee]

"Most of our imported oil comes from OPEC. Nigeria and Venezuela are hardly secure sources of oil for the US."

Yes, but the largest exporter of oil to this country is Canada.