The US and Canada are both Multinational/Multicultural/Multiethnic/Whatever, and it's worked out pretty well. The key with the US is that the different peoples have 1) a common language, which helps them 2) constantly be in contact with each other, preventing xenophobia and 3) lots of intermarriage, blending the nations 4) an identity of immigration rather than "this has always been our homeland" and 5) a loyalty to the combined union rather than to any particular nation or state.
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@simval
The US and Canada are both Multinational/Multicultural/Multiethnic/Whatever, and it's worked out pretty well. The key with the US is that the different peoples have 1) a common language, which helps them 2) constantly be in contact with each other, preventing xenophobia and 3) lots of intermarriage, blending the nations 4) an identity of immigration rather than "this has always been our homeland" and 5) a loyalty to the combined union rather than to any particular nation or state.