Choose the best word or phrase from the drop-down boxes to complete each sentence. after world war ii ended, korea was divided into two countries. the northern half of the country was . in june 1950, north korea invaded south korea, seeking to unify the countries. president harry truman believed was responsible for the north's invasion. at first, the north captured most of the south's territory, but the joint force pushed the north back to the border with china. the chinese joined the war and took seoul.