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While the evaluation certainly may have been in retaliation, the facts you describe don't suggest an illegal form of retaliation. Very few forms of retaliation are actually illegal in employment law.
Making a complaint about race, religion, gender, age, disability or medical leave use discrimination is protected and so retaliation for making those complaints is illegal. Retaliation for complaining about OSHA safety issues, wage and hour complaints to the Department of Labor, or retaliation for attempting the creation of a union are also illegal.
Unfortunately, retaliation based on questions about your future within the company is not illegal.