The Architectural Barriers Act (ABA), a federal law created in 1968 that stipulates all buildings, other than privately owned residential facilities, constructed by or on behalf of, or leased by the United States, or buildings financed in whole or in part by the United States, must be physically accessible for people with disabilities.
The Rehabilitation Act is a federal law first passed in 1973. The purpose of Section 504 of the Rehabilitation Act was to make sure that people with disabilities will have the same opportunities in federally funded programs as people without disabilities. For example, this section is very important in the design of schools and universities. Both physical access to the buildings and spaces, as well as equal access to participation in the programs, must be available.
Thanks to ICC for summary