Being 'all White' does not lead to a homogeneous culture. America was at its greatest risk of self-annihilation during the American Civil War, but it must be remembered that this was a clash between two mutually exclusive homogeneous White cultures, each claiming to be democratic, yet democracy completely failed to prevent the civil war. In fact, democratic decisions made WITHIN each of these factions lead to the decision to go to war. This goes directly to the root of my point - does trying to maintain multiple cultures in a democratic nation potentially lead to a polarization of two mutually exclusive factions, leading to the collapse of the democracy? The American Civil War never did end, it continues in the background festering away, and that has lead to the threat to American democracy that we see today. Democracy within each side in the Civil War worked well because the two cultures were homogeneous in their destination, and the vote was used to determine the path each separate culture would take. But democracy completely collapsed into adversarial fighting when the two cultures tried to work as one Nation. The American Civil War should never have happened - each side should have been given the democratic freedom to chose their own destination. The Civil War resulted because the North refused to allow the South to determine their own destination in a democratic process, over-ruling the democratic decision of the South through military means.

Canada has tried to avoid this clash of cultures through the invocation of 'distinct nation' status to Quebec, in a system that allows the people of Quebec to determine their own destination. For instance, civil law in Quebec follows the Napoleonic Code, whereas civil law in the rest of Canada follows the British Common Law system.

Also, being of one race is not necessary for a homogeneous culture. Early Roman Catholicism unified much of Europe into one homogeneous culture driven by the Catholic religion, even though it covered people of many races and ethnicities.