The answer is Sinners in the Hand of an Angry God
The Great Awakening was a series of Christian revivals, so a sermon on sinners fits the timeframe.
In 1934 the Communists suffered huge losses against the nationalists in the Chinese Civil War. Faced with the prospect of annhilation the leaders of the Comunist army shose to start what is now called the Long March. This was a tactic of withdrawal into mountainous areas, some 2500 miles to the north and west. The purpose was simple: survival. By undertaking a tactical withdrawal the Communists could ensure that they still had an effective fighting force; could select easy to defend locations; could regroup and could ensure that the Nationalists supply lines were long and susceptible to attacks.
Men were needed to work in war-related industries in the North. Most white men were being drafted, while draft boards were so racist that blacks tended to be excluded, and available to fill the industrial jobs.
