The document provides background on the shifting balance of power in East Asia after World War 2 and the onset of the Cold War between the US and USSR. It discusses:
1) How the US came to dominate Asia after WW2 due to other powers being weakened while the US emerged as a major superpower.
2) How the balance started to shift with the establishment of communist China in 1949 and challenges to Western colonial rule in Asia.
3) How the relationship between the former WW2 allies of the US and USSR soured due to clashes in ideology, military power, and spheres of influence, giving rise to the Cold War.