Queensland Parliament: Never a One-House System

Incorrect premise. The Queensland Parliament has always been bicameral in name, but since 1922 it has functioned as a unicameral legislature.

• 1860–1922: Two houses—Legislative Assembly (elected) and Legislative Council (appointed for life).
• 1922: The Legislative Council voted to abolish itself (the "Suicide Club").
• Since 1922: Only the Legislative Assembly remains. Queensland is the only Australian state with a unicameral parliament.

So it didn't "become a one-house system"—it abolished its upper house a century ago and has governed with a single chamber since.