One purpose of the present paper is to clarify the history of education for children with disabilities in public schools in the United States, focusing especially on the establishment and development of special day classes and special schools, because that marked a starting point for today's education for children with disabilities in public schools. The paper discusses trends of research on this topic conducted since 1990. Special classes are currently regarded by radical inclusionists as typical of special education, which they contend is a root cause of the discrimination against and segregation of children with disabilities. However, to the contrary, special classes were intended originally to provide education that was appropriate for children with disabilities, not to exclude them from regular classes nor to segregate them apart from the other children. It is important to find out what results have been achieved by special classes, and whether they have failed to achieve the desired results, so that modern inclusive education does not repeat past mistakes. Much traditional historical research on special classes, except for general histories of education, has focused on the period immediately after their establishment. However, the purposes and realities of the original special classes are not well known, except for those in large cities such as Boston, New York, and Chicago. However, the essence, purposes, realities, results, and problems of special classes varied significantly, depending on the types of disability and classes involved, the location, and the historical period. A second purpose of the present paper, therefore, is to propose a new research method combining horizontal and vertical perspectives.
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