Final answer:
The statement is True. The question addresses the tentative nature of concessions in negotiations, contextualized by historical events, such as the Treaty of Paris, where agreements concerning Loyalists and American Indians were not fully honored in practice.
Step-by-step explanation:
The question refers to the negotiation dynamics and results related to historical treaties, such as the Treaty of Paris. It is true that all concessions in a negotiation are tentative until the final agreement is signed. In the context of the Treaty of Paris, this can be further exemplified by the treatment of Loyalists and the American Indians, where the treaty's promises were not fully executed in practice. Specifically, the Treaty of Paris ultimately failed to protect the interests of American Indians and Loyalists post-signing, and the British were slow to evacuate territories despite the agreement.