"Koreans didn't want their country cut in two. It had been an economic, cultural and political unit under the Japanese. The North mined coal the South needed. The South grew food the North needed. Was the chief effect on Korea of the war for liberation to be loss of unity? Were Yank and Russian liberators to be worse than Japanese oppressors?Korean complaints that liberation was meaningless without unity and independence won General MacArthur sympathy. Yet he couldn't order order his Yanks out of southern Korea as long as the Russians held the North. Pulling out the Yanks would just be an invitation to communize all Korea."
The Soviet Army moved into northern Korea during the August of 1945, click here to read about it...
