political party, Group of persons organized to acquire and exercise political power. Formal political parties originated in their modern form in Europe and the U.S. in the 19th century. Whereas mass-based parties appeal for support to the whole electorate, cadre parties aim at attracting only an active elite; most parties have features of both types. All parties develop a political program that defines their ideology and sets out the agenda they would pursue should they win elective office or gain power through extraparliamentary means. Most countries have single-party, two-party, or multiparty systems (see party system). In the U.S., party candidates are usually selected through primary elections at the state level.
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