To give up territory or power is called cede
Retreat
Assimilate
Veto
Cede
Im 98% sure that the answer is retreat
To "cede" means to give up territory or power of a country, often through treaties, wars, or negotiations. It has historical significance as it can change political boundaries and affect governance. Example instances include Virginia's cession of lands to the U.S. and Germany's territorial losses after World War I.
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