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Canada's prime minister traveled to Alberta for a two-day visit ahead of Monday's separation referendum, warning that 'the stakes are high' for national unity. The vote, which has gained momentum amid western Canadian grievances over federal energy and economic policy, could set a precedent for provincial secession movements. The visit represents Ottawa's most direct intervention yet in the campaign, as polls suggest a competitive race. The outcome is being closely watched both in Canada and the US given its potential economic and political ripple effects.