What Is 31st Legislative Assembly of Ontario

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Last updated: April 15, 2026

Quick Answer: The 31st Legislative Assembly of Ontario was in session from June 2, 1987, to September 5, 1990, following the 1987 provincial election. It was controlled by the Ontario Liberal Party under Premier David Peterson, who led a majority government.

Key Facts

Overview

The 31st Legislative Assembly of Ontario was a pivotal session in the province’s political history, lasting from June 2, 1987, to September 5, 1990. It followed the May 2, 1987, provincial election, which resulted in a sweeping victory for the Ontario Liberal Party under Premier David Peterson.

This Assembly marked the first time since 1937 that the Liberals held a majority government in Ontario. The session saw significant legislative activity, including reforms in education, healthcare, and environmental policy. The Assembly operated at Queen’s Park in Toronto, where Members of Provincial Parliament (MPPs) debated and passed laws.

How It Works

The Legislative Assembly of Ontario operates as the elected legislative body responsible for creating, amending, and repealing provincial laws. Each Assembly is numbered sequentially and begins after a general election.

Comparison at a Glance

Comparing the 31st Assembly to adjacent sessions highlights shifts in party dominance and legislative focus.

AssemblyYears ActiveGoverning PartySeats HeldOpposition Leader
29th1985–1987Liberal–NDP Accord48 (Liberal)Lawrence Grossman (PC)
30th1987–1990Progressive Conservative52 (PC)David Peterson (Liberal)
31st1987–1990Liberal (Majority)95 (Liberal)Bob Rae (NDP)
32nd1990–1995NDP (Majority)74 (NDP)Mike Harris (PC)
33rd1995–1999Progressive Conservative82 (PC)Dan McLean (Liberal)

The 31st Assembly stands out for the Liberal Party’s unprecedented majority, which contrasted sharply with the minority and coalition governments of the previous decade. This shift enabled swift passage of key legislation but also increased scrutiny of government accountability.

Why It Matters

The 31st Legislative Assembly had lasting impacts on Ontario’s governance and policy landscape. Its majority government structure allowed for rapid legislative action, but also highlighted the risks of reduced opposition oversight.

The 31st Assembly remains a benchmark for legislative productivity and political realignment in Ontario, illustrating how electoral mandates shape public policy.

Sources

  1. WikipediaCC-BY-SA-4.0

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