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Dominant-party system

A dominant-party system, or one-party dominant system, is a political occurrence in which a single political party continuously dominates election results over running opposition groups or parties. Any ruling party staying in power for more than one consecutive term may be considered a dominant party (also referred to as a predominant or hegemonic party). Some dominant parties were called the natural governing party, given their length of time in power. Dominant parties, and their domination of a state, develop out of one-sided electoral and party constellations within a multi-party system (particularly under presidential systems of governance), and as such differ from states under a one-party system, which are intricately organized around a specific party. Sometimes the term "de facto one-party state" is used to describe dominant-party systems which, unlike a one-party system, allows (at least nominally) democratic multiparty elections, but the existing practices or balance of political power effectively prevent the opposition from winning power, thus resembling a one-party state. Dominant-party systems differ from the political dynamics of other dominant multi-party constellations such as consociationalism, grand coalitions and two-party systems, which are characterized and sustained by narrow or balanced competition and cooperation. Between 1950 and 2017, more than 130 countries were included in the list of dominant-party systems at different times. Dominant-party systems are commonly based on majority rule for proportional representation or majority boosting in semi-proportional representation. Plurality voting systems can result in large majorities for a party with a lower percentage of the vote than in proportional representation systems due to a fractured opposition (resulting in wasted votes and a lower number of parties entering the legislature) and gerrymandering. Critics of the "dominant party" theory argue that it views the meaning of democracy as given, and that it assumes that only a particular conception of representative democracy (in which different parties alternate frequently in power) is valid.

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