The biggest motivator for US oil isn’t really controversial, in fact, it’s a well known historical lesson. When Germany decided to ship all of its Panzer and Tiger divisions from the Eastern Front to France to meet the invading Americans they did so at great cost to their supplies of oil and refined fuel. By the time they arrived Germany was out of gas. The first push in the Battle of the Bulge ran through American and British troops like they weren’t there and had they not ran out of gas, they likely would have won the war. American military doctrine from that day forward has been 1.) never run out of oil 2.) control the enemies oil supply. From 1980’s Afghanistan to Kuwait to Venezuela right now, same thing. Control China and Russia’s access to oil.