You whine like a little c*nt that no one answers your question, then you get an answer you don’t like because it proves you wrong, and you blow it off.
Such a douche.
But, I’ll humor you anyway:
We buy oil from others because (once again) oil production is not nationalized here (that means the government does not own oil drilling and extraction).
We buy from the WORLD market because, at times, the world market prices are lower. That’s how business operates.
This may shock you, but even Trump bought suits on the world market and resold them here, even though all of his suits COULD be produced here. If you need me to explain why he would do that, just ask.
Are you under the assumption that oil extraction is owned by our government and we can just tell refiners that they can only buy crude from US oil companies?