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In page Canadian Confederation:

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In this Canadian context, confederation here describes the political process that united the colonies in the 1860s, related events and the subsequent incorporation of other colonies and territories.[4] The term is now often used to describe Canada in an abstract way, such as in "the Fathers of Confederation". Provinces and territories that became part of Canada after 1867 are also said to have joined, or entered into, confederation (but not the Confederation).[5] The term is also used to divide Canadian history into pre-Confederation (i.e. pre-1867) and post-Confederation (i.e. post-1867) periods.[6]