The claim you describe may not technically be a "termination," because you are a contractor, but you do seem to have raised enough questions here that a visit to a plaintiffs' employment law attorney (even though you were a contractor -- he or she will understand this and also be familiar with the applicable law) in New York would be well advised.
If you are an at-will employee, you can be fired for any reason or no reason, except unlawful discrimination. If you do not have an employment contract or union to represent you, your recourse is limited. Discrimination based on age, gender, race, religious beliefs etc.... may give rise to a different answer. Gender, age, religious belief, race etc. all are discriminatory reasons for which you cannot be legally fired and upon which you might base a wrongful termination suit.
You might find my Legal Guide helpful "Workplace Discrimination: A Basis for Wrongful Termination Claims"
You might find my Legal Guide helpful "How to Choose a Lawyer for you.”
You might find my Legal Guide helpful "What Do I Tell My Lawyer"?
No one can know what the record is in the case because online we cannot find out any details. If you have a discrimination theory about retaliatory discharge or hostile workplace conditions you'll need a lawyer. Check with a lawyer in your locale to discuss more of the details.
Good luck to you.
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