American-izing Immigrants- What do you think?

Everyone who immigrates to a new country should fully adopt, or do their best to adopt the ways and culture of that new country. That is what the "melting pot" was all about. If not, it will get to the point where people don't feel like Americans anymore, but rather they will consider themselves whatever nationality where they or their parents or grandparents came from (like I am starting to). This ruins the unity of any society and will lead to problems.