A political system in which there is only one legalized political party is called a ________

The answer is "de jure one-party system". A de jure one-party system is a political system in which there is only one political party that is legally allowed to exist and operate. This means that other political parties are either banned or not recognized by the government. In a de jure one-party system, the ruling party typically controls all aspects of the government and has a monopoly on political power. This type of political system is often associated with authoritarian or totalitarian regimes, where the government seeks to control all aspects of society and suppress dissenting views. Examples of countries that have had de jure one-party systems include the Soviet Union, China under Mao Zedong, and North Korea. In contrast, a de facto one-party system is a political system in which one party dominates the political landscape, but other parties are technically allowed to exist and operate. This type of political system is often associated with countries that have a weak opposition or limited political competition, but without the legal prohibition of other parties. In summary, a de jure one-party system is a political system in which only one party is legally allowed to exist and operate, and it is often associated with authoritarian or totalitarian regimes.