By the beginning of october of 1950, un forces had pushed the north koreans back to pusan. the 38th parallel. the yalu river. seoul.

By the beginning of October of 1950, UN forces had pushed the North Koreans back to the Yalu River. Option three is correct.

By September 1950, UN forces led by the American General MacArthur landed in Inchon and immediately pushed the North Koreans back over the 38th parallel. Later on, by October 1950 they had  rolled back the communists to the Yalu River on the border with China.

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain