By means of the South Manchurian Railway , Japanese entrepreneurs vigorously exploited Manchuria .
Politically and economically , Korea became a protectorate of Japan and in 1910 was formally annexed as a part of the empire ( cf. Korea under Japanese rule ) .
By means of the South Manchurian Railway , Japanese entrepreneurs vigorously exploited Manchuria .
Politically and economically , Korea became a protectorate of Japan and in 1910 was formally annexed as a part of the empire ( cf. Korea under Japanese rule ) .