Following the rebellion in Lower Canada, and the similar rebellion in Upper Canada (now
Ontario), the British government decided to merge the two provinces into a single province, as recommended by
Lord Durham in the
Durham Report. The
Union Act, 1840, passed by the
British Parliament, abolished the two provinces and their separate parliaments, and created the
Province of Canada, with a single Parliament for the entire province, composed of an elected
Legislative Assembly and an appointed
Legislative Council. The
Governor General retained a strong position in the government. In the general elections in 1841 for the
first Parliament of the new Province, Morin was elected unopposed in the
Nicolet constituency. At first, he had been inclined to support the union of the two Canadas because it would help to create an alliance between the reform groups in the two provinces. He ultimately opposed the union because the Act created equal representation of the two regions in the new Parliament, in spite of Lower Canada's greater population. He campaigned on an anti-union platform. In the first major vote in the Assembly, he was a co-sponsor of a motion condemning the union, which was defeated but attracted the support of all but two of the French-Canadian members. During the rest of the first session of the Parliament, he was also a consistent opponent of the government of Governor General
Lord Sydenham. On January 1, 1842, Morin resigned his seat on appointment to the district court for
Rimouski, but he served on the bench for less than a year. The new governor general, Sir
Charles Bagot tried to entice Morin to become the clerk of the Executive Council. Morin declined that offer, and Bagot instead suggested that Morin should be
Commissioner of Crown Lands, an Executive Council position that required Morin to hold a seat in the Assembly. Morin accepted that offer. Bagot appointed the member for
riding of Saguenay,
Étienne Parent as the Clerk of the Executive Council, which vacated the Saguenay riding. Morin resigned from the court and was appointed Commissioner of Crown Lands and a member of the Executive Council on October 13, 1842, as a member of the 1st ministry Reform ministry of
Louis-Hippolyte Lafontaine and
Robert Baldwin. He was re-elected to Parliament, from the vacant Saguenay riding, in November, 1842. Back in Parliament, continued as a member of the French-Canadian group. He supported Baldwin and Lafontaine a year later in the major dispute with the new Governor General, Sir
Charles Metcalfe, where all the members of the Lafontaine-Baldwin ministry resigned, except for one minister,
Dominick Daly. Morin threw himself into his work as commissioner, learning about agriculture himself, and improving agricultural education for farmers. He also considered infrastructure issues, such as roads and windmills. He personally acquired land and began to perform experiments with new agricultural methods, which he published in
La Minerve and in American agricultural journals. He also founded new parishes north of Montreal:
Val-Morin,
Sainte-Adèle (from the name of his wife), and
Morin-Heights all were begun under his auspices. == Joint Premier of the Province of Canada ==