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This paper tries to explain the evolution of one party dominance in parliamentary democracies. Party dominance means more than a series of electoral victories or governing longevity. Rather, party dominance is often marked by a party's exclusive mandate inshaping and managing the country's political economy. This paper tries to explain how such an exclusive mandate could be obtained, mainted, and terminated. To explain it, paper focuses on democratic class struggles during the critical historical juncturesin which intransigent partisan confrontation and competition occurred over conflicting visions of social and economic management. Under the curcumstance, party dominance is contingent on a party's successful mobilization of solid, durable, and comprehensive social allinace. Maintenance of dominance is contingent on the continuation of confrontation with major political opponent and effective shift of alliance partner in accrordance with the long-term change of class structure. The loss of dominance is caused by the growth of consensus among major political parties on economic management and social arrangements and resulting dealignment of core supporters and alliance partners.