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name two geographical features that separated ancient china from other civilizations

The Himalayas and the Yangtze river.

Explanation:

The Himalayas separated china from the south west close to India, and the Yangtze river secluded it from the north eastern side. This helped prevent invasions and let china mostly control it's trade routes.

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the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.