The additional-member system (AMS) is a mixed electoral system under which most representatives are elected in single-member districts (SMDs), and the other "additional members" are elected to make the seat distribution in the chamber more proportional to the way votes are cast for party lists. It is distinct from parallel voting in that the "additional member" seats are awarded to parties taking into account seats won in SMDs, which is not done under parallel voting.
The Congress of the Union, formally known as the General Congress of the United Mexican States, is the legislature of the federal government of Mexico consisting of two chambers: the Senate of the Republic and the Chamber of Deputies. Its 628 members meet in Mexico City.
The Chamber of Deputies is the lower house of the Congress of the Union, the bicameral parliament of Mexico. The other chamber is the Senate. The structure and responsibilities of both chambers of Congress are defined in Articles 50 to 70 of the constitution.
The Senate of the Republic, constitutionally Chamber of Senators of the Honorable Congress of the Union, is the upper house of Mexico's bicameral Congress. It currently consists of 128 members, who serve six-year terms.
The Senate is the upper house of the States General, the legislature of the Netherlands. Its 75 members are elected on lists by the members of the twelve States-Provincial and four electoral colleges for the Senate every four years, within three months of the provincial elections. All provinces and colleges have different electoral weight depending on their population.
Elections in Mexico are held every 6 years to elect a president and every 3 years to elect a legislature. These elections determine who, on the national level, takes the position of the head of state – the president – as well as the legislature.
The Chamber of Deputies is the lower house of the bicameral Italian Parliament, the upper house being the Senate of the Republic. The two houses together form a perfect bicameral system, meaning they perform identical functions, but do so separately. The Chamber of Deputies has 400 seats, of which 392 will be elected from Italian constituencies, and 8 from Italian citizens living abroad. Deputies are styled The Honourable and meet at Palazzo Montecitorio.
Romania elects on a national level a head of state – the president – and a legislature. The president is elected for a five-year term by the people. The Romanian Parliament has two chambers. The Chamber of Deputies has currently 330 members, elected for a four-year term by party-list proportional representation on closed lists. The Senate has currently 136 members, elected for a four-year term by party-list proportional representation on closed lists.
All elections in the Czech Republic are based on the principle of universal suffrage. Any adult citizen who is at least 18 years old can vote, except those who have been stripped of their legal capacities by a court, usually on the basis of mental illness. Elected representatives are elected directly by the citizens without any intermediaries. Election laws are not part of the constitution, but – unlike regular laws – they cannot be changed without the consensus of both houses of the Parliament. The Czech Republic uses a two-round plurality voting system for the presidential and Senate elections and an open party-list proportional representation system for all other elections. The proportional representation system uses the Sainte-Laguë method for allocating seats.
The Senate of Zimbabwe is the upper of the two chambers in Zimbabwe's Parliament. It existed from independence in 1980 until 1989, and was re-introduced in November 2005. The other chamber of Parliament is the National Assembly.
Legislative elections were held in Mexico on 18 August 1991, alongside gubernatorial elections in six states. The Institutional Revolutionary Party (PRI) won 320 of the 500 seats in the Chamber of Deputies and 31 of the 32 seats up for election in the Senate. Voter turnout was 61% in the Chamber election and 62% in the Senate election.
The 1994 Italian general election was held on 27 and 28 March 1994 to elect members of the Chamber of Deputies and the Senate of the Republic for the 12th legislature. Silvio Berlusconi's centre-right coalition won a large majority in the Chamber of Deputies but just missed winning a majority in the Senate. The Italian People's Party, the renamed Christian Democracy (DC), which had dominated Italian politics for almost half a century, was decimated. It took only 29 seats versus 206 for the DC two years earlier—easily the worst defeat a sitting government in Italy has ever suffered, and one of the worst ever suffered by a Western European governing party.
A snap election was held in Italy on 13–14 April 2008. The election came after President Giorgio Napolitano dissolved the Italian Parliament on 6 February 2008, following the defeat of the government of Prime Minister Romano Prodi in a January 2008 Senate vote of confidence and the unsuccessful tentative appointment of Franco Marini with the aim to change the current electoral law. Under Italian law, elections must be held within 70 days of the dissolution. The voting determined the leader of Italy's 62nd government since the end of World War II. The coalition led by ex-Prime Minister Silvio Berlusconi from The People of Freedom party defeated that of former Mayor of Rome, Walter Veltroni of the Democratic Party.
Electoral districts go by different names depending on the country and the office being elected.
The federal electoral districts of Mexico are the 300 constituencies or electoral districts into which Mexico is divided for the purpose of federal elections. Each district returns one federal deputy (diputado), who sits in the Chamber of Deputies, the lower house of the Federal Congress. An additional 200 deputies are elected by proportional representation from the five electoral regions.
The Federal Government of Mexico is the national government of the United Mexican States, the central government established by its constitution to share sovereignty over the republic with the governments of the 31 individual Mexican states, and to represent such governments before international bodies such as the United Nations. The Mexican federal government has three branches: executive, legislative, and judicial and functions per the Constitution of the United Mexican States, as enacted in 1917, and as amended. The executive power is exercised by the executive branch, which is headed by the president and his Cabinet, which, together, are independent of the legislature. Legislative power is vested upon the Congress of the Union, a bicameral legislature comprising the Senate and the Chamber of Deputies. Judicial power is exercised by the judiciary, consisting of the Supreme Court of Justice of the Nation, the Council of the Federal Judiciary, and the collegiate, unitary, and district courts.
The 2013 Italian general election was held on 24 and 25 February 2013 to determine the 630 members of the Chamber of Deputies and the 315 elective members of the Senate of the Republic for the 17th Italian Parliament. The centre-left alliance Italy Common Good, led by the Democratic Party (PD), obtained a clear majority of seats in the Chamber of Deputies thanks to a majority bonus that effectively trebled the number of seats assigned to the winning force and narrowly defeated the centre-right alliance of former Prime Minister Silvio Berlusconi in the popular vote. Close behind, the new anti-establishment Five Star Movement of comedian Beppe Grillo became the third force, well ahead of the centrist coalition of outgoing Prime Minister Mario Monti. In the Senate, no political group or party won an outright majority, resulting in a hung parliament.
The Italian electoral law of 2017, colloquially known by the nickname Rosatellum bis or simply Rosatellum after Ettore Rosato, the Democratic Party (PD) leader in the Chamber of Deputies who first proposed the new law, is a parallel voting system, which acts as a mixed electoral system, with 37% of seats allocated using a first-past-the-post electoral system and 63% using a proportional method, with one round of voting. The Chamber and Senate of the Republic did not differ in the way they allocated the proportional seats, both using the largest remainder method of allocating seats.
General elections were held in Paraguay on 22 April 2018. President Horacio Cartes and Vice-President Juan Afara of the Colorado Party were not eligible for re-election. The presidential elections were won by the Colorado Party's Mario Abdo Benítez, who defeated Efraín Alegre of the GANAR alliance. The Colorado Party also won the most seats in the Senate and Chamber of Deputies. The new President and Vice-President took office on 15 August 2018 and will leave office in August 2023.
The LXIV Legislature of the Mexican Congress was the meeting of the Mexican Congress of the Union that convened on 1 September 2018 and ended on 31 August 2021. It is composed of the 500 federal deputies and 128 senators elected in the 2018 Mexican general election. While the deputies served only in the LXIV Legislature, the senators, elected to six-year terms, also formed the Senate in the LXV Legislature, which convened in 2021.
Baja California, 
Baja California Sur, 
Chihuahua, 
Durango, 
Jalisco, 
Nayarit, 
Sinaloa, and 
Sonora 
Aguascalientes, 
Coahuila, 
Guanajuato, 
Nuevo León, 
Querétaro, 
San Luis Potosí, 
Tamaulipas, and 
Zacatecas 
Campeche, 
Chiapas, 
Oaxaca, 
Quintana Roo, 
Tabasco, 
Veracruz, and 
Yucatán 
Mexico City, 
Guerrero, 
Morelos, 
Puebla, and 
Tlaxcala 
Colima, 
Hidalgo, 
State of Mexico and 
Michoacán