Not to be nitpicky, but there is a huge swath of reasons for claim of wrongful termination. Also included are: whistleblowing statutes, wage and hour statues (depending on your state), EEOC (which you note), ADA (even pregnancy [and most medical problems] can classify as a de-facto disability), FMLA, etc. I know employers like to think that they can just up and terminate an employee "just because" ... but it isn't always necessarily true & can cause direct exposure to various types of lawsuits if there was no reasonable cause for termination.