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The transfer of sovereignty over a territory by means of a treaty. This may either be a peace treaty (e.g. the peace treaty between France and Germany in 1871 that made Alsace-Lorraine part of the German empire), a treaty to exchange territory (e.g. the treaty of 1890 whereby the UK ceded Heligoland to Germany in exchange for Zanzibar), or more rarely a treaty bestowing a gift. See also derivative title.

Subjects: International Law.

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