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What caused the Chinese to send 300,000 troops to North Korea? A. The UN regained control of South Korea. B. The UN troops pushed North Koreans to the Yalu River. C. The UN voted to support South Korea in the conflict with North Korea. D. The UN decided to place the troops under the command of Douglas MacArthur.
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Step 1:
To solve this problem, I'll analyze the historical context of the Korean War and the specific events that led to Chinese intervention.

Step 2:
: Understand the Initial Conflict

The Korean War began in June 1950 when North Korea invaded South Korea. The United Nations, led by the United States, intervened to support South Korea.

Step 3:
: Analyze the UN and US Military Progress

By late 1950, UN troops (primarily US forces under General Douglas MacArthur) had successfully pushed North Korean forces back and were advancing deep into North Korean territory.

Step 4:
: Identify the Critical Turning Point

The UN troops approached the Yalu River, which is the border between North Korea and China. This was a critical moment that threatened China's strategic interests.

Step 5:
: Determine China's Motivation

China became concerned that UN troops (led by the US) might invade or threaten Chinese territory. The proximity of UN troops to the Chinese border was seen as a direct security threat.

Step 6:
: Evaluate the Specific Trigger

The UN troops pushing North Koreans to the Yalu River was the primary reason China decided to send 300,000 troops into North Korea to support the North Korean forces.

Final Answer

The UN troops pushed North Koreans to the Yalu River. This event prompted China to intervene directly in the Korean War to create a buffer zone and prevent what they perceived as potential US aggression near their border.