Final answer:
The Americans with Disabilities Act (ADA) of 1990 prohibits discrimination in employment based on disability and requires reasonable accommodations. It also mandates accessibility in public transportation and accommodations.
Step-by-step explanation:
The Americans with Disabilities Act (ADA) of 1990 had a significant impact on improving opportunities and protections for people with disabilities. It prohibits discrimination in employment based on disability and requires employers to provide reasonable accommodations. The ADA also mandates that public transportation and accommodations be made accessible to those with disabilities.