amendments to the constitution of canada british north america acts calgary declaration canadian charter of rights and freedoms canadian federalism charlottetown accord constitution of canada constitutional debate in canada disallowance and reservation double aspect education french canadian guy favreau implied bill of rights interjurisdictional immunity jean lesage liberal party of canada living tree doctrine meech lake accord new democratic party official language patriation pith and substance point of no return property and civil rights provinces and territories of canada quebec quebec act saskatchewan tommy douglas trade and commerce unsuccessful attempts to amend the canadian constitution victoria charter