By 1923 in the Northwest, most Indian schools had closed and Indian students were attending public schools. States took on increasing responsibility for their education. Other studies suggest attendance in some Indian boarding schools grew in areas of the United States throughout the first half of the 20th century, doubling from 1900 to the 1960s. Enrollment reached its highest point in the 1970s. In 1973, 60,000 American Indian children were estimated to have been enrolled in an Indian boarding school. In 1976, the Tobeluk vs Lund case was brought by teenage Native Alaskan plaintiffs against the State of Alaska alleging that the public school situation was still an unequal one.