At the time of Canadian Confederation in 1867, the portion of Northern Ontario lying south of the Laurentian Divide was part of Ontario, while the portion north of the divide was part of the separate British territory of Rupert's Land. The province's boundaries were provisionally expanded northward and westward in 1874, while the Lake of the Woods region remained subject to a boundary dispute between Ontario and Manitoba. The region was confirmed as belonging to Ontario by decision of the Judicial Committee of the Privy Council in 1884, and confirmed by the Canada (Ontario Boundary) Act, 1889 of the Parliament of the United Kingdom, which set the province's new northern boundary at the Albany River.