Eras

The first decades of Canadian nationhood, when party lines were fluid and personal loyalty mattered more than party discipline.

26 events dated inside these years

The conscription crisis of 1917 caused the largest mass floor crossing in Canadian history, splitting the Liberal Party along linguistic lines.

13 events dated inside these years

Economic devastation drove politicians to seek radical new solutions - including starting new parties.

6 events dated inside these years

Quebec transformed from a conservative, church-dominated society into a modern, secular one. The sovereignty movement emerged, led by politicians who crossed the floor to build it.

38 events dated inside these years

Pierre Trudeau's 16-year dominance reshaped Canadian politics. Floor crossings during this era were often about joining the winning side.

35 events dated inside these years

The failure of constitutional reform triggered the founding of the Bloc Québécois and the near-dissolution of Canada in the 1995 referendum.

32 events dated inside these years

The Canadian right fractured into three parties, then slowly reunited. Floor crossings were part of the realignment.

85 events dated inside these years

Stephen Harper's centralized control of the Conservative caucus drove several MPs out - but also attracted opportunistic crossers like Emerson.

70 events dated inside these years

BC United members moved to the BC Conservatives during the 2023–2024 realignment. Individual crossings and group summaries must be reconciled before reporting a count.

92 events dated inside these years

Three Conservative MPs crossed to join PM Mark Carney's Liberal government - the first significant federal crossings in years.

91 events dated inside these years