More exceptionally, the United States did not resort to a coercive political ideology such as Stalinist Communism to unite the diverse, or embrace an all-encompassing religious orthodoxy in the manner of the dramatic spread of Islam between the 8th and 16th centuries among widely disparate peoples. ...…

And China's Communist bosses also fear religion.  Particularly Islam and Christianity.  Islam is in the northwestern part. Communist regime is also afraid of China's millennia-long instability and significant cultural and social fractures.  ..…