One man, one vote (or one person, one vote) is a slogan used by advocates of political equality through various electoral reforms such as universal suffrage, proportional representation, or the elimination of plural voting, malapportionment, or gerrymandering.
The British trade unionist George Howell used the phrase "one man, one vote" in political pamphlets in 1880. During the 20th-century period of decolonisation and the struggles for national sovereignty, from the late 1940s onwards this phrase became widely used in developing countries where majority populations sought to gain political power in proportion to their numbers. The slogan was notably used by the anti-apartheid movement during the 1980s, which sought to end white minority rule in South Africa.
In the United States, the "one person, one vote" principle was invoked in a series of cases by Warren Court in the 1960s.[a] Applying the Equal Protection Clause of the United States Constitution, the Supreme Court majority opinion (8-1) led by Chief Justice Earl Warren in Reynolds v. Sims (1964) ruled that state legislatures needed to redistrict in order to have congressional districts with roughly equal represented populations. In addition, the court ruled that, unlike the United States Congress, both houses of state legislatures needed to have representation based on districts containing roughly equal populations, with redistricting as needed after censuses.
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This phrase was traditionally used in the context of demands for suffrage reform. Historically the emphasis within the House of Commons was on representing areas: counties, boroughs and, later on, universities. The entitlement to vote for the Members of Parliament representing the constituencies varied widely, with different qualifications over time, such as owning property of a certain value, holding an apprenticeship, qualifying for paying the local-government rates, or holding a degree from the university in question. Those who qualified for the vote in more than one constituency were entitled to vote in each constituency, while many adults did not qualify for the vote at all. Plural voting was also present in local government, whereby the owners of business property qualified for votes in the relevant wards.
Reformers argued that Members of Parliament and other elected officials should represent citizens equally, and that each voter should be entitled to exercise the vote once in an election. Successive Reform Acts by 1950 had both extended the franchise eventually to almost all adult citizens (barring convicts, lunatics and members of the House of Lords), and also reduced and finally eliminated plural voting for Westminster elections. Plural voting for local-government elections outside the City of London was not abolished until the Representation of the People Act 1969.
But, there were two significant exceptions:
The City of London had never expanded its boundaries and, with many residential dwellings being replaced by businesses, and the destruction of The Blitz, after the Second World War the financial district had barely five thousand residents altogether. The system of plural voting was retained for electing the City of London Corporation, with some modifications.
When Northern Ireland was established in 1921, it adopted the same political system then in place for the Westminster Parliament and British local government. But the Parliament of Northern Ireland did not follow Westminster in changes to the franchise from 1945. As a result, into the 1960s, plural voting was still allowed not only for local government (as it was for local government in Great Britain) but also for the Parliament of Northern Ireland. This meant that in local council elections (as in Great Britain) ratepayers and their spouses, whether renting or owning the property, could vote while company directors had an extra vote by virtue of their company's status. However, unlike the situation in Great Britain, non-ratepayers did not have a vote in local government elections. The franchise for elections to the Parliament of Northern Ireland had been extended in 1928 to all adult citizens who were not disqualified, at the same time as the franchise for elections to Westminster. However, University representation and the business vote continued at Stormont to 1969, while they were abolished for Westminster (including Westminster seats in Northern Ireland) in 1948. University representation still exists in Seanad Éireann, the upper house of the Oireachtas (parliament) of the Republic of Ireland. Historians and political scholars have debated the extent to which the franchise for local government contributed to unionist electoral success in controlling councils in nationalist-majority areas.
Based on a number of inequities, the Northern Ireland Civil Rights Association was founded in 1967. It had five primary demands, and added the demand that each citizen in Northern Ireland be afforded the same number of votes for local government elections (as stated above, this was not yet the case anywhere in the United Kingdom). The slogan "one man, one vote" became a rallying cry for this campaign. The Parliament of Northern Ireland voted to update the voting rules for Stormont elections, which were implemented for the 1969 Northern Ireland general election, and for local government elections, which was done by the Electoral Law Act (Northern Ireland) 1969, passed on 25 November 1969.
The United States Constitution requires a decennial census for the purpose of assuring fair apportionment. Reapportionment has generally been conducted without incident with the exception of the reapportionment that should have followed the 1920 Census, which was effectively skipped pending resolution by the Reapportionment Act of 1929. Congressional seats have been reapportioned based on population changes between states. State legislatures initially established election of congressional representatives from districts, often based on traditional counties or parishes which preceded founding of the new government. The question arose as to whether the state legislatures were required to ensure that congressional districts were roughly equal in population and to draw new districts to accommodate demographic changes.
Some states redrew their U.S. House districts every ten years to reflect changes in population patterns; many did not. Some never redrew them, except when it was mandated by a change in the number of seats to which that state was entitled in the House of Representatives. In many states, this led to a skewing of influence for voters in some districts over those in others. For example, if the 2nd congressional district eventually had a population of 1.5 million, but the 3rd had only 500,000, then, in effect - since each district elected the same number of representatives - a voter in the 3rd district had three times the voting "power" of a 2nd-district voter. Alabama's state legislature resisted redistricting from 1910 to 1972 (when forced by federal court order). As a result, rural residents retained a wildly disproportionate amount of power in a time when other areas of the state became urbanized and industrialized, attracting greater populations. Such urban areas were under-represented in the state legislature and underserved; their residents had difficulty getting needed funding for infrastructure and services. They paid far more in taxes to the state than they received in benefits in relation to the population.
The Constitution includes the result of the Great Compromise resulting in representation for the US Senate. Each state was equally represented in the Senate with two representatives, without regard to population. The Founding Fathers considered this principle of such importance that they included a clause in the Constitution to prohibit any state from being deprived of equal representation in the Senate without its permission; see Article V of the United States Constitution. For this reason, "one person, one vote" has never been implemented in the U.S. Senate, in terms of representation by states.
When states established their legislatures, they often adopted a bicameral model based on colonial governments. Many copied the Senate principle, establishing an upper house based on geography - for instance a state senate with one representative drawn from each county. By the 20th century, this often led to state senators having widely varying amounts of power, with ones from rural areas having votes equal to senators representing much greater urban populations.
Activism in the Civil Rights Movement to regain the ability of African Americans in the South to register and vote highlighted other voting inequities across the country. In 1964-1965, Civil Rights Act of 1964 and Voting Rights Act of 1965 were established, restoring the voting rights of African Americans. Numerous court challenges were raised, including in Alabama due to the lack of reapportionment, for decades.
In Colegrove v. Green, 328 U.S. 549 (1946) the United States Supreme Court held in a 4-3 plurality decision that Article I, Section 4 left to the legislature of each state the authority to establish the time, place, and manner of holding elections for representatives.
However, in Baker v. Carr, 369 U.S. 186 (1962) the United States Supreme Court under Chief Justice Earl Warren overturned the previous decision in Colegrove holding that malapportionment claims under the Equal Protection Clause of the Fourteenth Amendment were not exempt from judicial review under Article IV, Section 4, as the equal protection issue in this case was separate from any political questions. The "one person, one vote" doctrine, which requires electoral districts to be apportioned according to population, thus making each district roughly equal in population, was further cemented by Warren Court in the landmark cases that followed Baker, including Gray v. Sanders, 372 U.S. 368 (1963) which concerned the County Unit System in Georgia, Reynolds v. Sims, 377 U.S. 533 (1964) which concerned state legislature districts, Wesberry v. Sanders, 376 U.S. 1 (1964) which concerned U.S. Congressional districts and Avery v. Midland County, 390 U.S. 474 (1968) which concerned local government districts.
The Warren Court's decision which was upheld in Board of Estimate of City of New York v. Morris, 489 U.S. 688 (1989).Evenwel v. Abbott, 578 U.S. ___ (2016) said states may use total population in drawing districts.
Under the 'M.P.V. System', however, no one person or voter has more than one effective vote for one office. No voter's vote can be counted more than once for the same candidate. In the final analysis, no voter is given greater weight in his or her vote over the vote of another voter, although to understand this does require a conceptual understanding of how the effect of a 'M.P.V. System' is like that of a run-off election. The form of majority preferential voting employed in the City of Ann Arbor's election of its Mayor does not violate the one-man, one-vote mandate nor does it deprive anyone of equal protection rights under the Michigan or United States Constitutions.
The "one man, one vote" election system has been successfully implemented in many developing countries, most notably India and South Africa. Notable leaders include Mahatma Gandhi and Nelson Mandela.
The term "One man, one vote, one time" has been applied to Rhodesia (now Zimbabwe), Zambia, and Angola, where elections were successfully held that were relatively free of corruption and violence, but then a strongman took hold and free voting ended.