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The Americans with Disabilities Act (ADA) was signed into law on July 26, 1990, by President George H.W. Bush. It was authored by Senator Tom Harkin of Iowa, who had been working on the legislation since the 1970s. The ADA prohibits discrimination against people with disabilities in employment, public accommodations, transportation, and telecommunications. It also requires public entities to provide access to their programs and services for people with disabilities.