This study examines the history of early childhood education institutions and childcare facilities from the perspective of early childhood education and care integration after the establishment of the government. Early childhood education institutions and childcare facilities were developed into independent institutions with different characteristics. The two institutions that were developed independently have been discussing integration with the enactment of the Early Childhood Education Promotion Act, the establishment of a public education system for early childhood education, and the introduction of the Nuri curriculum. In the process of discussing integration, the two institutions changed to resemble each other, and early childhood education and care integration became a major policy issue in the fields of early childhood education and early childhood care. There are three reasons for the failure of the early childhood education and care integration derived from historical considerations. First, the services of early childhood education and childcare depend on private facilities. Second, the government shows a lack of will and strategy for integration. Third, an integrated model that can meet the various needs of early childhood education and childcare could not be presented.