In your opinion, what is the role of immigrant literature in enriching Arab culture?

It is said that diaspora literature arose as a result of the migration of Arabs to the West. Talk briefly about this topic?
2- In your opinion, what is the role of immigrant literature in enriching Arab culture?
3- Do you think that diaspora literature was the basis for building the Arab-American identity? Talk about this topic briefly?
4- What are the most important features or characteristics of diaspora literature? How many and explain only one of them?