What are your opinions on multiculturism and how nations should handle foreign immigrants?

My opinion,

I always have had no problem with foreign immigrants becoming citizens of the country they wish to move to. However, I have alwys been a supporter of integration into the community. For example, language. Everyone should be able to speak their choice of language at home, however, in a nation where a language is either the national language or needed to succeed, the immigrant should be taught at least a basic fluency to get by. A basic knowledge in the history of their nation should be taught, in order to give them a familiarization to their new home. The teachings of civil liberties, especially when it comes to people from areas where these are not either accepted nor followed, and Western values.

A person should always be able to keep their culture and language with them, but they need to adapt to the nation they move to.