We might think that racial discrimination at the US border is an American problem, but if we don't challenge it forcefully it becomes a Canadian one too. We have negotiated an agreement with the Americans for visa-free travel between our two countries--if the Americans start deciding that this applies only to those of us with white skin and we let it slide than we will be tacitly accepting that we have a citizenship whose value varies depending on race.  It is unacceptable.