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A single-party state, one-party system or single-party system is a type of party system government...

A single-party state, one-party system or single-party system is a type of party system government in which a single political party forms the government and no other parties are permitted to run candidates for election. Sometimes the term de facto single-party state is used to describe a dominant-party system where laws or practices prevent the opposition from legally getting power. Some single party states only outlaw opposition parties, while allowing subordinate allied parties to exist as part of a permanent coalition such as a popular front. Within their own countries, dominant parties ruling over single-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 former People's Republic of Poland it referred to the Polish United Workers' Party. A one-party system should not be confused with a non-partisan democracy which prohibits all political parties. Also, some one-party states may allow non-party members to run for legislative seats, as was the case with Taiwan's Tangwai movement in the 1970s and 1980s. In most cases, single-party states have arisen