What were the effects of the Russo-Japanese War? Check all that apply.Japan was viewed as the most powerful nation in East Asia.Japan added Manchuria to its territory.Russia defeated the Japanese fleet.The Treaty of Portsmouth was signed.Japan’s influence in Korea increased.

Japan’s victory over Russia established it as the leading power in East Asia and increased its influence in Korea. The war ended with the Treaty of Portsmouth in 1905. Japan gained influence and rights in parts of Manchuria, but it did not add Manchuria to its territory; Japan defeated, rather than Russia defeated, the Russian fleet.

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