Answer:
For centuries before the division, the peninsula was a single, unified Korea, ruled by generations of dynastic kingdoms. Occupied by Japan The war grew out of conflict between the two countries for supremacy in Korea. Korea had long been China's most important client state, but its strategic location opposite the Japanese islands and its natural resources of coal and iron attracted Japan's interest. The areas of historical tension between South Korea and Japan range widely, including over the name of the body of water separating Japan and the Korean Peninsula (Sea of Japan or East Sea); sovereignty over a group of rocky islets between the two countries (Dokdo/Takeshima); the legality of Japan's colonization
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