What would happen if a war was declared on oil?

Let’s just say we drop all the other wars as (literally) practically irrelevant. The war on drugs. The war in Iraq. The War in Afghanistan. Your stupid personal war. The jihadists’ war against America. The unknown foreigners’ war vs. The State (somewhere). Maybe we should drop all these wars and start a new mission.

War on oil. What would happen if we decided we aren’t going to buy anymore oil? Is this an impossibility? Would it cause the world to move forward at a faster pace to the future with new, viable and usable technology? Could it happen?

I don’t feel there are any simple or logical answers to this question…I was just wondering.