What are Linguistic Implications of Invasion and Migration on Literature?

Can you please provide implications for the following: The Linguistic implication of migration and invasion on the development of the English Language: A critical Appraisal

Literature is based on the language and stories of a particular culture. As invasions and migrations take place, that culture is mixed with others. Stories about what happened are then told in both languages, and they spread to other cultures. They can also be translated to even more languages, where they are picked up by others. When culture changes, so does language and literature.