Question

the korean war began in 1950 when the
soviet union attacked south korea.
united nations invaded north korea.
communist north attacked the non - communist south.
people of korea rose up against the japanese.

Explanation:

The Korean War commenced on June 25, 1950, when the communist Democratic People's Republic of Korea (North Korea) launched a full-scale invasion of the non-communist Republic of Korea (South Korea). The other options are incorrect: the Soviet Union did not directly attack South Korea, the United Nations forces intervened later to support South Korea (not invade North Korea initially), and the Korean resistance against Japan occurred before WWII, not in 1950.

Answer:

Communist North attacked the non-Communist South.