What would be some ideal things to talk about in an essay discussing imilation when foreigners come to U.S.?

I need to write about imilation for foreigners coming to America. I need some ideas that are complex. I need to talk about how a first (who came to America) and second generation (who were born in America) adjust to their lifestyles and how each culture affects them. It is for a higher level English cl. I'm trying to brainstorm, but I need ideas for an essay I am about to write. Any ideas will help. Thanks