Landmark 1990 antidiscrimination legislation, for short

As a detective trying to solve the mystery of this crossword clue, the first thing I noticed was that it references 1990, which means it must be something that happened or was significant in that year. Then, looking at the rest of the clue, the term ‘antidiscrimination legislation‘ immediately made me think of a law or act that was passed to combat discrimination in some way. From there, I started thinking about any notable legislation that was passed in the United States in 1990 pertaining to this issue. And then it hit me – the Americans with Disabilities Act (ADA) was signed into law in 1990 and is regarded as landmark legislation for its efforts to combat discrimination against individuals with disabilities. With this insight, I was able to confidently fill in the answer ‘ADA‘ in the crossword puzzle.