Under Illinois law, employers may not discriminate based on race, color, religion, sex, national origin, ancestry, age, marital status, physical or mental handicap, military status, sexual orientation, or unfavorable discharge from military service.
This means that an Illinois employer may not use any of those classifications as a deciding factor in employment decisions.
Employers are required to make reasonable accommodations for persons with disabilities. So, if you are disabled, and would be able to do the job if reasonable workplace changes were made, the employer cannot use your disability as a reason to not hire you or fire you.
Note that nothing in the Illinois law forces employers to consider applicants who are not qualified for a job.
For example, if you have a disability which prevents you from doing the job, an employer may refuse to hire you. Or, if an employer is seeking people to model men’s clothing, they do are not breaking the law if they only hire men. In this case, women, by virtue of their sex, are not qualified to do the job.