What kinds of historical and social events influenced art between the world wars, and how did these events shape poetry?

Answer the following

What are the aesthetic differences between the two strands of modernism covered in the poetry unit? What kinds of historical and social events influenced art between the world wars, and how did these events shape poetry?
Expatriate writers left America and wrote of being American from afar. Migrant writers came to America and described Americans as they found them. Compare and contrast one writer from each group. How were their views of America similar and dissimilar? Illustrate your response with quotations from the texts.

The literary references to be used are attached