Abolition
Many jurisdictions, such as Denmark, Sweden, Venezuela, New Zealand and the Canadian provinces of Quebec, Nova Scotia, Prince Edward Island, Manitoba and New Brunswick, once possessed upper houses but abolished them, to adopt unicameral systems. Newfoundland had a Legislative Council prior to joining Canada, as did Ontario when it was Upper Canada. The Australia state of Queensland also used to have a Legislative council, which it abolished in 1922, but all other Australian states continue to have bicameral systems.
Titles of upper houses
See also: List of national legislatures.