Reform movement (pre-Confederation Canada)
In Upper Canada (Ontario), the Reform movement was formed in opposition to the Family Compact. It was led initially by William Lyon Mackenzie, who became the principal figure in the Upper Canada Rebellion of 1837. Mackenzie went into exile as a result of the failed rebellion. The uprising led to the 1839 Durham Report, which recommended responsible government and the union of Upper and Lower Canada as a means of assimilating Francophones. Only the union of the Canadas was to be immediately implemented.
Parliament of Upper Canada
Following the Rebellions of 1837 and Lord Durham's 1839 Report to the British Government, Upper Canada and Lower Canada were rejoined in 1841 to create the Province of Canada. The Parliament of Upper Canada was therewith replaced by the newly created Parliament of the United Province of Canada.