I know when discussing the history of American cities, racial tensions and "white flight" of white Americans choosing to move away from racial minorities (in particular black Americans after the Great Migration to northeast and midwest cities) is seen as uniquely an American thing.
But thinking about it, clearly other western countries were no more welcoming to minorities in the 20th century. For example, Africville in Nova Scotia in Canada was a segregated black community. Western countries ranging from Canada to Australia reacted strongly to Asian-descent and African-descent immigrants. Tensions existed with Afro-Caribbean and South Asian immigration to the UK, and Arabs and Africans to France.
Didn't these racial interactions lead to changes and impacts on these other non-Americans' cities?
W.E.B Du Bois wrote that the color line belts the globe and that the problem of the twentieth century is that problem of the color line (eg. how the Europeans, and non-Europeans like Africans, Asians and their descendants related to one another was not only a domestic but international problem).
Okay, maybe there are some differences, since black Americans' and white Americans' responses to one anothers' living patterns in cities were domestic migrations, but in other places -- the UK, France, Canada, New Zealand, NZ, minorities whether domestic (eg. indigenous peoples, long-standing minority groups) or new immigrants who were racial minorities in their new home, did provoke a response by the local citizens in terms of where people chose to or didn't choose to live or let others live, right? Even if not legal segregation, many western countries nonetheless still did respond and have their character shaped by the presence of minorities.
Why is it rarely discussed that white flight shaped other places outside the US? If so, the idea that the US has its cities uniquely plagued by the problem of racial tensions that hinder urban cohesion wouldn't be as prominent, since it's not alone.
Wikipedia, even though it describes "white flight" as a term being American in origin, does list some examples of
"white flight" in its article introducing the topic, that are non-American, ranging from Europeans like Danes and Norwegians fleeing neighbourhoods with non-European immigrants, White South Africans leaving even South African itself after the end of apartheid, to New Zealanders who are white moving away from areas with lots of Maori and Pacific Islanders. So, to idealize the idea that non-American places are more racially harmonious to argue that American cities can't do certain things they can do, might be not necessarily valid.