Mexico

Donald Trump has stated that he would build a wall along the southern border and have Mexico pay for it and this was considered a joke by many talking heads. The US imports 900,000 barrels of oil per day from Mexico and the current price is $50 per barrel. The border is 2,000 miles long and a double wall/fence would cost 4 million dollars per mile or 8 billion dollars. The US now has enough oil to completely replace the imports from Mexico so they are in a strong bargaining position. The US could tell Mexico that they will pay 10 dollars less per barrel over the next two and a half years and use that money to build the wall.