From 1910 to the end of World War II in 1945, Korea was under Japanese rule. Most Koreans were peasants engaged in subsistence farming. In the 1930s, Japan developed mines, hydro-electric dams, steel mills, and manufacturing plants in northern Korea and neighboring Manchuria. The Korean industrial working class expanded rapidly, and many Koreans went to work in Manchuria. As a result, 65% of Korea's heavy industry was located in the north, but, due to the rugged terrain, only 37% of its agriculture.
From 1910 to the end of World War II in 1945, Korea was under Japanese rule. Most Koreans were peasants engaged in subsistence farming. In the 1930s, Japan developed mines, hydro-electric dams, steel mills, and manufacturing plants in northern Korea and neighboring Manchuria. The Korean industrial working class expanded rapidly, and many Koreans went to work in Manchuria. As a result, 65% of Korea's heavy industry was located in the north, but, due to the rugged terrain, only 37% of its agriculture.