This is a small segment of a larger PBS documentary about the disability rights movement. It gives a taste of the push behind the disability rights movement and the legislative history thereof.
1971: Washington State House Bill 90: Education for all signed into law
1973: Rehabilitation Act of 1973 signed into law
1974: Family Educational Rights and Privacy Act (FERPA) signed into law
1975: Education for All Handicapped Children Act signed into law
1990: EHA replaced by the Individuals with Disabilities Education Act (IDEA)
1992: Americans with Disabilities Act signed into law
2004: Reauthorization of IDEA
2008: Americans with Disabilities Act Amendments Act signed into law
Source: Media Dis&Dat - Disability Blog