You won't find many Europeans that want their countries turned into a melting pot. Nationalism and cultural identity are strong here, given the history it's perfectly valid and understandable. You shouldn't compare USA with the rest of the world since it's founding is based on completely different values.
People here expect you to integrate and respect the laws of the country. So far majority of them show no interest in any.
Wikipedia says english is national language.
Fine it's not official on federal level but it looks like it's getting there.