From the Vermont state website:
Vermont is considered an “at will” state. An employer may terminate an employee for any reason as long as it is not one of the protect classes e.g.: race, color, national origin, religion, sex, age or mental or physical disability. Vermont law also prohibits discrimination based on sexual orientation, HIV status, place of birth, and age over 18. It is also unlawful to retaliate or discriminate against employees or applicants that have alleged employment discrimination.
From the Oregon state website:
The common law rule regarding the employer-employee relationship allows the termination of the relationship by either party, without notice and without cause.
Oregon courts have long followed this general rule of "at-will" employment. This means that generally, in the absence of a contract or statute to the contrary, Oregon employers may discharge an employee at any time and for any reason, or for no reason at all.
From the New York state website:
Q: Can an employee be fired without due cause?
A: Yes. New York State is an "employment-at-will," state. Without a contract restricting termination (such as a collective bargaining agreement) an employer has the right to discharge an employee at any time for any reason. This also protects the employee's right to resign. An employer may fire an employee for "no reason" - or even for a reason that might seem arbitrary and unfair -- and the employee is equally free to quit at any time without being required to explain or defend that decision.
From the Colorado state website:
Employment-At-Will
Colorado follows the legal doctrine of "employment-at-will" which provides that in the absence of a contract to the contrary, neither an employer nor an employee is required to give notice or advance notice of termination or resignation. Additionally, neither an employer nor an employee is required to give a reason for the separation from employment.
From the Illinois state website:
Can an employer terminate me without advance notice or without giving a reason or an unfair reason for the termination?
Yes. Illinois is an "employment at-will" state, meaning that an employer or employee may terminate the relationship at any time, without any reason or cause. The employer, however, cannot discriminate based on race, color, religion, sex, national origin, ancestry, citizenship status, age, marital status, physical or mental handicap, military service or unfavorable military discharge
Shall I go on?