What would America be like if immigrants never came?

If immigrants had never come to America then there would be major
changes in the state and our society. Some changes that would occur might
be there won't be any different cultures or maybe it would Americans by
themselves. If it was just Americans then they won't have the opportunity to
learn about different races or cultures. Also it's true that it would be less
crowded and most people would think that it would be a safer state to live
at. Also I think that people would be fatter because all the fast food but when
you have different types of food it's not as bad. This is what I think if immigrants
had never come to America.