What role did China play in the conflict? How did it impact the decisions of the Americans?

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Explanation:

In October 1950, Chinese troops under the name of the Chinese People's Volunteer Army (CPV) crossed the Yalu River to assist North Korean armies, and engaged in the Korean War in an offensive manner after the U.S. troops crossed the 38th parallel.

https://www.khanacademy.org/humanities/us-history/postwarera/1950s-america/a/the-korean-war

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.