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Canada is also America's largest foreign supplier of crude oil.

A weaker dollar makes crude oil cheaper for countries that hold other currencies.

For its part, the US continues to be happy to buy Guyana's key exports of crude oil, gold and bauxite, which is the ore from which aluminium is extracted.

Meanwhile, worries about a trade war between the US and China sent the price of Brent crude oil down more than 4%, following a fall of more than 10% last week.

That pipeline failure, which occurred under different ownership, spewed an estimated 140,000 gallons of crude oil, harmed hundreds of miles of coastline and cost millions to clean up.