Two countries fought to conquer Port Arthur(warm water port in Pacific Ocean).It occured on onset of 1905.
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Russo-Japanese War
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Sino-Japanese war-I
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Sino-Japanese war-II
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Opium War
A
Correct answer
Explanation
The Russo-Japanese War (1904-1905) was fought over control of Port Arthur (now Lüshunkou), a strategic warm-water port on the Liaodong Peninsula. The war began with a Japanese surprise attack and ended with the Treaty of Portsmouth. The other options don't match: Sino-Japanese wars involved different conflicts (1894-95, 1937-45), and the Opium Wars (1839-42, 1856-60) were between China and Britain.