The action that United Nation forces should have done differently to avoid China entering the war is listening to warnings and halting their advance.
<h3>What led to the statement by MacArthur?</h3>
When about 180,000 Chinese troops shattered the right flank of Walker's Eighth Army in the west and threatened to destroy the X Corps near the Chosin Reservoir.
This made MacArthur informed the Joint Chiefs that "<em>We face an entirely new war</em>".
<span>Supremacy Clause </span>the US Constitution and federal laws and treaties made in accordance with the Constitution are the <span>supreme law of the land.
