What triggered the beginning of the korean war?

a communist north korea invaded south korea.
b the soviet union declared north korea a satellite state.
c the soviet union established a strong military presence in korea.
d china came to the support of north korea.

a) Communist North Korea invaded South Korea.

Explanation:

The Korean War started when the North Korean Communist armed force crossed the 38th Parallel and attacked non-Communist South Korea. As Kim Il-sung's North Korean armed force, equipped with Soviet tanks, rapidly overran South Korea, the United States came to South Korea's guide.

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