Dictatorship
One-party

One-party dictatorships are governments in which a single political party dominates politics. Single-party dictatorships are one-party states in which only the party in power is legalized, sometimes along with minor allied parties, and all opposition parties are banned. Dominant-party dictatorships or electoral authoritarian dictatorships are one-party dictatorships in which opposition parties are nominally legal but cannot meaningfully influence government. Single-party dictatorships were most common during the Cold War, with dominant-party dictatorships becoming more common after the fall of the Soviet Union. Ruling parties in one-party dictatorships are distinct from political parties that were created to serve a dictator in that the ruling party in a one-party dictatorship permeates every level of society.

One-party dictatorships are more stable than other forms of authoritarian rule, as they are less susceptible to insurgency and see higher economic growth. Ruling parties allow a dictatorship to more broadly influence the populace and facilitate political agreement between party elites. Between 1950 and 2016, one-party dictatorships made up 57% of authoritarian regimes in the world, and one-party dictatorships have continued to expand more quickly than other forms of dictatorship in the latter half of the 20th century. Due to the structure of their leadership, one-party dictatorships are significantly less likely to face civil conflict, insurgency, or terrorism than other forms of dictatorship. The use of ruling parties also provides more legitimacy to its leadership and elites than other forms of dictatorship and facilitates a peaceful transfer of power at the end of a dictator's rule.

One-party dictatorships became prominent in Asia and Eastern Europe during the Cold War as communist governments were installed in several countries. One-party rule also developed in several countries in Africa during decolonization in the 1960s and 1970s, some of which produced authoritarian regimes. A ruling party in a one-party dictatorship may rule under any ideology or it may have no guiding ideology. Marxist one-party states are sometimes distinguished from other one-party states, but they function similarly. When a one-party dictatorship develops gradually through legal means, it can result in conflict between the party organization and the state apparatus and civil service, as the party rules in parallel and increasingly appoints its own members to positions of power. Parties that take power through violence are often able to implement larger changes in a shorter period of time.
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