One reason for the oil sands / bitumen being sent south is that Canada doesn’t have the refining capacity to deal with it. The majority of refineries that can process it are in the USA. Many dozens of them. There hasn’t been any meaninful investment in expanding oil sands refining capacity in Canada in decades. Alberta has some limited capacity to process oil sands but it’s only a tiny fraction of the US capacity.
On top of that, many provinces are blocking pipeline construction so for Alberta to export product refined from oil sands in Canada is difficult. It’s easier to send it south and then let the Americans send it back across the border in various other provinces.
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