The Chinese decided to enter the Korean War on November 25-26, 1950. This was an enormous shock to the American forces, as well as to the United Nations. The United States, and in particular U.S. Gen. Douglas MacArthur, believed that the Chinese would not openly enter the war. When China did provide support to North Korea, the effect was catastrophic on the American forces, leading to a great expansion of the conflict.
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D. the revolutionary leader of Cuba for over four decades
Explanation:
After the war ended and during Reconstruction, the Northern industrial economy had made important progress, particularly in manufacturing and railroad-building. The struggle for political reform and eventual legal changes, like the Civil Rights Act and the Fifteenth Amendment, affected the North as well as the South