These was a cause of the Korean War?
A. North Korea embraced communism while South Korea choose democracy.
B. South Korea rejected American policies accepted by North Korea.
C. North Korea established a blockade to prevent goods reaching South Korea.
D. South Korea entered into a treaty with China that endangered North Korea.

A. North Korea embraced communism while South Korea choose democracy.

Explanation:

Today, historians generally agree on several main causes of the Korean War, including: the spread of communism during the Cold War, American containment, and Japanese occupation of Korea during World War II.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.