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Canada deserves to know.
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Canada's federal electoral map is redrawn after each decennial census in a two-stage process. First, a formula in the Constitution Act, 1867 allocates seats among the provinces: each province's population is divided by an electoral quotient, and two long-standing floors are then applied — the senatorial clause (no province gets fewer MPs than it has senators) and the grandfather clause (no province falls below a guaranteed historical seat count, updated in 2022 so that no province has fewer seats than it held in the 43rd Parliament). Second, the boundaries inside each province are redrawn by ten independent commissions, one per province, created under the Electoral Boundaries Readjustment Act. Each commission has three members: a chair, who is a judge appointed by the chief justice of the province, and two other members appointed by the Speaker of the House of Commons. Commissions publish proposed maps, hold public hearings, and consider objections filed by MPs through a House committee — but the commissions, not the politicians, have the final word. The system, in place since 1964, was built specifically to take boundary-drawing out of the hands of the governing party. The redistribution that followed the 2021 census added five seats — three in Alberta and one each in British Columbia and Ontario — bringing the House to 343 members, the map on which the 2025 general election was fought.
A Canadian federal election fills the seats of the House of Commons — 343 of them as of the 2023 redistribution. Each seat represents a riding (electoral district), and voters in each riding choose among local candidates. The candidate with the most votes in a riding wins it outright; this is first-past-the-post (single-member plurality), and a winner needs only more votes than any rival, not a majority. Canadians do not directly vote for the Prime Minister or the government; the party (or coalition) that can command the confidence of the House — usually the one with the most seats — forms government, and its leader becomes Prime Minister. Elections are triggered by the Governor General dissolving Parliament on the Prime Minister's advice, subject to the fixed-election-date law (a default date that does not prevent an earlier call). The independent, non-partisan agency Elections Canada, led by the Chief Electoral Officer (an officer of Parliament), administers the vote. Because first-past-the-post translates votes to seats riding-by-riding, the national seat share routinely diverges from the national vote share — a party can win the most seats without the most votes, and small vote swings can produce large seat swings.