The previous collapse after only three months of a coalition government formed by George-Étienne Cartier and Conservative John A. Macdonald (the sixth government in six years) had demonstrated that continued governance of Canada East and Canada West under the 1840 Act of Union had become untenable.
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He worked as a Cabinet Minister within the Great Coalition government to ensure that the rights of Catholics were protected in the new Confederation of provinces in British North America in 1867.