If the opposing party makes an offer of settlement and you expressly indicate your acceptance, the settlement is binding and the underlying claims are resolved. Any further litigation would revolve around enforcement of the settlement agreement.
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This is not legal. The damages you are entitled to are set by statute in Oregon. An employment attorney in Oregon can lead you in the right direction.
Unless you have an employment contract or are a member of a protected class, your employer can terminate your employment at will. If you do belong to a protected class, the termination is wrongful only if it was motivated by a discriminatory intent. If you believe the firing was discriminatory, look further into Texas's protection laws. Some states offer more protections than the federal government, e.g., age or sexual orientation.