Independent Contractor
Signing an agreement with the heading "Independent Contractor Agreement" does not make you an independent contractor. If you are terminated from a position that was labeled independent contractor but was an employment relationship in practice, you may actually be considered an employee under Illinois law (and federal law as well). Why is this this important? Because as an employee you have rights that are unavailable to independent contractors. For example, discrimination and wage laws do not apply to independent contractors. Furthermore, employees have access to unemployment benefits; independent contractors do not.
How do you know if you were really an employee? It depends. The Illinois Department of Labor, the Illinois Department of Employment Security and the IRS all have slightly different standards in determining whether you were an employee or independent contractor. The most basic question is whether you were free from direction and control of your employer.
Did you perform a job that was unrelated to the purpose of the company for which you worked? Did you make your own schedule? Did you use your own equipment and materials?
This is not an exhaustive list of the questions that the agencies will consider to determine your status, but it's a good place to start. If you were under the control of your employer and treated more like an employee than an independent business, you may be entitled to employment related benefits and your employer may be subjected to a number of penalties.