These events posed a major challenge to the Truman Administration and to America's allies. If the invasion were not checked, it would set a precedent that could easily undermine the confidence of post-WWII countries relying on the U.S. for protection. Countries like South Korea. How was it that a nation, politically unified for two millennia, was now fighting itself?
<Tab/>Japan had annexed Korea in 1910 and ruled it until the end of WWII. When Japan lost the war, Korea (like Germany) would be divided into two areas. The Soviet Union, and its allies, would operate in the North while the US, and its allies, would operate in the South.
North Korea, meanwhile, formed its own government: The Democratic People's Republic of Korea. Kim Il Sung was its leader and his government claimed jurisdiction over the entire Korean Peninsula (including the South).
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