There are no options, but still, the cold war led to the separtion of the Koreas, after 1910 Korea was under Japanese domination, after 1945 with the defeat of Japan Korea was divided into two, the north under Soviet influence and the South mainly under American influence. in 1948 there was noagreement on how to unify the parts and it caused not only the separation but also it cuminated with the Korean war in 1950.