A one-party state, single-party state, one-party system or single-party system is a governance structure in which only a single political party controls the ruling system. All other parties are either outlawed or only enjoy limited and controlled participation in elections. Sometimes the term "de facto one-party state" is used to describe a dominant-party system that, unlike the one-party state, allows (at least nominally) democratic multiparty elections, but the existing practices or balance of political power effectively prevent the opposition from winning power.
Although it is predated by the 1714 to 1783 "age of the Whig oligarchy" in Great Britain, the rule of the Committee of Union and Progress (CUP) over the Ottoman Empire following the 1913 coup d'état is often considered the first one-party state.
Current one-party states
As of the following countries are legally constituted as one-party states:
Concept
One-party states justify themselves through various methods. Most often, proponents of a one-party state argue that the existence of separate parties runs counter to national unity. Others argue that the one party is the vanguard of the people, being its most politically aware members, and therefore the party's right to rule cannot be legitimately questioned. The Soviet government argued that the existence of multiple political parties would perpetuate class struggle, so only a single party could lead a classless proletariat; it therefore made the Communist Party of the Soviet Union the only authorised political party.
Conversely, Russian historian Vadim Rogovin attributed the establishment of the one-party system to the conditions which were “imposed on Bolshevism by hostile political forces”. Rogovin highlighted the fact that the Bolsheviks made strenuous efforts to preserve the Soviet parties such as the Socialist-Revolutionaries, Mensheviks, and other left parties within the bounds of Soviet legality and their participation in the Soviets on the condition of abandoning armed struggle against the Bolsheviks.
Some one-party states only outlaw opposition parties, while allowing allied parties to exist as part of a permanent coalition (such as a popular front). However, these allied parties are largely or completely subservient to the ruling party and must accept the ruling party's monopoly of power as a condition of their existence. Examples of this are the National Front in former East Germany and the Democratic Front for the Reunification of Korea in North Korea. Other states outlaw all other parties yet allow non-party members to run for legislative seats as independents, as was the case with Taiwan's Tangwai movement in the 1970s and 1980s, as well as the elections in the former Soviet Union. Still others have only a single legal party, membership of which is a prerequisite for holding public office, such as in Turkmenistan under the rule of Saparmurat Niyazov or Zaire under Mobutu Sese Seko.
Within their own countries, dominant parties ruling over one-party states are often referred to simply as the Party. For example, in reference to the Soviet Union, the Party meant the Communist Party of the Soviet Union; in reference to the pre-1991 Republic of Zambia, it referred to the United National Independence Party.