Study these maps, then use the drop-down menus to answer the questions



[ A,B,C,D ] Chinese forces joined North Korea and pushed the UN forces back to the 38th parallel.



[ A,B,C,D ]North Korea invades South Korea and pushes UN forces back to Pusan.



[ A,B,C,D ]The war reaches a stalemate with neither side advancing too far past the 38th parallel.



[ A, B,C D ]General MacArthur drives the North Korean forces back to the Yalu River.