The document summarizes the history of Korea before and during the Korean War. It describes how Korea was occupied by Japan from 1910 to 1945. After World War II, Korea was divided along the 38th parallel, with the Soviet Union occupying the north and the United States occupying the south. This led to the establishment of two separate governments under Kim Il-sung in North Korea and Syng-Man Rhee in South Korea. Tensions rose between the two sides, culminating in the North's invasion of South Korea on June 25, 1950, starting the Korean War. The US and UN allies defended South Korea while China later entered the war on North Korea's side, leading to a prolonged conflict until an armistice in 1953