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What did Tanzania used to be called?

Mainland Tanzania was known as Tanganyika. In 1964 it formed a union with the island of Zanzibar off the coast; the new country was named the United Republic of Tanganyika and Zanzibar. It was renamed the United Republic of Tanzania in October 1964. Tanganyika was also known as German East Africa in the late 19th and early 20th centuries.