Oil-rich Alberta holds a nonbinding referendum on Monday on whether the western province should secede from Canada, a debate many believe will not be settled by what is widely expected to be a defeat for the separatist cause.Polls have consistently shown that a majority of Alberta voters oppose splitting from Canada. Economic grievances have fueled the independence campaign in the province, which is home to 5 million people and slightly smaller than Texas despite having one-sixth the populatio...