Unicameralism

Unicameral legislatures exist when there is no widely perceived need for multicameralism. Many multicameral legislatures were created to give separate voices to different sectors of society. Multiple chambers allowed for guaranteed representation of different social classes (as in the Parliament of the United Kingdom or the French States-General), ethnic or regional interests, or subunits of a federation. Where these factors are unimportant, in unitary states with limited regional autonomy, unicameralism often prevails. Sometimes, as in New Zealand and Denmark, this comes about through the abolition of one of the two chambers, or, as in Sweden, through the merger of the two chambers into a single one, while in others a second chamber has never existed.

The People's Republic of China has a Chinese People's Political Consultative Conference which meets alongside the National People's Congress and is in many respects an advisory "upper house", so it is in reality neither bicameral nor unicameral. Cuba has a unicameral legislature and many formerly Communist states, such as Ukraine, Moldova and Serbia, have retained their unicameral legislatures, though others, such as Romania and Poland, adopted bicameral legislatures. Both the former Russian SFSR and the Union of Soviet Socialist Republics (USSR) were bicameral. The two chambers were the Soviet of Nationalities and the Soviet of the Union. The Russian Federation retained bicameralism after the dissolution of the USSR and the transition from existing socialism to capitalism.[1]

The principal advantage of a unicameral system is more efficient lawmaking, as the legislative process is simpler and there is no possibility of deadlock. Proponents of unicameralism have also argued that it reduces costs, even if the number of legislators stay the same, since there are fewer institutions to maintain and support it. However bicameral legislatures offer the opportunity to debate and correct errors in either chamber in parallel, and in some cases to introduce legislation in either chamber. Bicameral legislatures often make provision for experts to participate in lawmaking without being professional politicians.

The main weakness of a unicameral system can be seen as the lack of restraint on the majority, particularly noticeable in parliamentary systems where the leaders of the parliamentary majority also dominate the executive. There is also the risk that important sectors of society may not be adequately represented.

  Nations with a bicameral legislature.

  Nations with a unicameral legislature.

  Nations with a unicameral legislature and an advisory body.

  Nations with no legislature.

Approximately half of the world's sovereign states are currently unicameral. As noted, the People's Republic of China is somewhat in between, with a legislature and a formal advisory body.

Many subnational entities have unicameral legislatures. These include the state of Nebraska and territories of Guam and the Virgin Islands in the United States, the Chinese special administrative regions of Hong Kong and Macau, the Australian state of Queensland as well as the Northern Territory and the Australian Capital Territory, a majority of the provinces of Argentina, all of the provinces and territories in Canada, all of the German states, all of the regions of Italy, all of the Spanish autonomous communities, both the autonomous regions of Portugal, most of the states and union territories of India and all of the states of Brazil. In the United Kingdom, the devolved Scottish Parliament, National Assembly for Wales, London Assembly, and Northern Ireland Assembly are also unicameral.

Federations

• All legislatures and legislative councils of the regions and communities of  Belgium
• All legislative assemblies in all states of  Brazil
• All legislative assemblies of the provinces and territories of  Canada
• All Landtage of the states of  Germany
• All legislative assemblies of the states of  Malaysia
• All legislatures in all states of  Mexico
• All legislatures of the provinces in    Nepal
• All legislatures of the provinces and territories in  Pakistan
• The legislature of the state of  Nebraska, and council of the  District of Columbia in the United States
• Parliament of  Queensland and the legislative assemblies of the territories of  Australia (but not the other states)
• Provincial legislatures of the provinces of  South Africa
• Narodna skupština of  Republika Srpska

Provincial legislatures in Argentina

• 15 of the provinces of  Argentina –  Chaco,  Chubut,  Córdoba,  Formosa,  Jujuy,  La Pampa,  La Rioja (Argentina),  Misiones,  Neuquén,  Río Negro (Argentina),  San Juan,  Santa Cruz,  Santiago del Estero,  Tierra del Fuego,  Tucumán and the autonomous city of  Buenos Aires.
• 22 of the states of  India – Arunachal Pradesh, Assam, Chhattisgarh, Goa, Gujarat, Haryana, Himachal Pradesh, Jharkhand, Kerala, Madhya Pradesh, Manipur, Meghalaya, Mizoram, Nagaland, Odisha, Punjab, Rajasthan, Sikkim, Tamil Nadu, Tripura, Uttarakhand and West Bengal; and 3 of the union territories – Delhi, Jammu and Kashmir and Puducherry.

Within U.S. states, Nebraska is currently the only state with a unicameral legislature; after a statewide vote, it changed from bicameral to unicameral in 1937.[2][3] A 2018 study found that efforts to adopt unicameralism in Ohio and Missouri failed due to rural opposition.[3] There was a fear in rural communities that unicameralism would diminish their influence in state government.[3]

Local government legislatures of counties, cities, or other political subdivisions within states are usually unicameral and have limited lawmaking powers compared to their state and federal counterparts.

In 1999, Governor Jesse Ventura proposed converting the Minnesota Legislature into a single unicameral chamber.[4] Although debated, the idea was never adopted.

Seven U.S. states, Arizona, Idaho, Maryland, New Jersey, North Dakota, South Dakota, and Washington, effectively have two-house unicamerals.

In those states, districts in the upper house and the lower house are combined into a single constituency, a practice known as nesting.

The U.S. territory of Puerto Rico held a non-binding referendum in 2005. Voters approved changing its Legislative Assembly to a unicameral body by 456,267 votes in favor (83.7%) versus 88,720 against (16.3%).[5] If both the territory's House of Representatives and Senate had approved by a ​²⁄₃ vote the specific amendments to the Puerto Rico Constitution that are required for the change to a unicameral legislature, another referendum would have been held in the territory to approve such amendments. If those constitutional changes had been approved, Puerto Rico could have switched to a unicameral legislature as early as 2015.

On June 9, 2009, the Maine House of Representatives voted to form a unicameral legislature, but the measure did not pass the Senate.[6]

Because of legislative gridlock in 2009, former Congressman Rick Lazio, a prospective candidate for governor, has proposed that New York adopt unicameralism.[7]

The United States as a whole was subject to a unicameral Congress during the years 1781–1788, when the Articles of Confederation were in effect. The Confederate States of America, pursuant to its Provisional Constitution, in effect from February 8, 1861, to February 22, 1862, was governed by a unicameral Congress.[8]

Though the current Congress of the Philippines is bicameral, the country experienced unicameralism in 1898 and 1899 (during the First Philippine Republic), from 1935 to 1941 ( the Commonwealth era) and from 1943 to 1944 (during the Japanese occupation). Under the 1973 Constitution, the legislative body was called Batasang Pambansa, which functioned also a unicameral legislature within a semi-presidential system form of government until 1986.

The ongoing process of amending or revising the current Constitution and form of government is popularly known as Charter Change. A shift to a unicameral parliament was included in the proposals of the constitutional commission created by former President Gloria Macapagal-Arroyo.[9] Unlike in the United States, senators in the Senate of the Philippines are elected not per district and state but nationally; the Philippines is a unitary state.[10] The Philippine government's decision-making process, relative to the United States, is more rigid, highly centralised, much slower and susceptible to political gridlock. As a result, the trend for unicameralism as well as other political system reforms are more contentious in the Philippines.[11]

While Congress is bicameral, all local legislatures are unicameral: the ARMM Regional Legislative Assembly, the Sangguniang Panlalawigan (Provincial Boards), Sangguniang Panlungsod (City Councils), Sangguniang Bayan (Municipal Councils), Sangguniang Barangay (Barangay Councils) and the Sangguniang Kabataan (Youth Councils).