The problem are how decolonisation happens without the massive losses in WWI and we won't see France focusing on getting the immigrant to France instead Algeria, if in 1960 the European population of Algeria are 26% instead of 13% the Algerian War of independence will trun even uglier. On the other hand a larger European population with more later arrivals, will likely have a less reactionary view of native rights.
As for USA without the state pushing for linguistic assimalation there's little reason for a German in South Dakota who own a farm and whose neighbours are also German speakers to adopt English as home language. In Europe the two things which resulted in the destruction of minority homelanguages was the rise of the state as a enforcer of a single language and the rise of mass media (television). Even here there have been limits, I want to pull out the Finnish region of Ostrobothnia up as example It's the only Finnish mainland region with a Swedish majority. It have a large Finnish speaking minority, who mostly live in the regional capital of Vaasa, while the Swedish speakers mostly live in the rural areas. This region have a population density of around the same as Nebraska.
In the same manner I expect the less densely populated states in USA function in the same manner the local Germans, Swedes and Norwegians live in relative isolation from the English speakers, they have their own schools. Of course if they interact across language border they likely use English as lingua franca. Which means that the bigger towns tend to be English speaking. As mass media rise, we don't see USA being dominated by one public broadcaster, so we see regional station broadcast in the local minority language. The dominance of English only end up dominate these states as increased urbanisation hits, but in rural areas people keep speaking their old languages.
As for USA without the state pushing for linguistic assimalation there's little reason for a German in South Dakota who own a farm and whose neighbours are also German speakers to adopt English as home language. In Europe the two things which resulted in the destruction of minority homelanguages was the rise of the state as a enforcer of a single language and the rise of mass media (television). Even here there have been limits, I want to pull out the Finnish region of Ostrobothnia up as example It's the only Finnish mainland region with a Swedish majority. It have a large Finnish speaking minority, who mostly live in the regional capital of Vaasa, while the Swedish speakers mostly live in the rural areas. This region have a population density of around the same as Nebraska.
In the same manner I expect the less densely populated states in USA function in the same manner the local Germans, Swedes and Norwegians live in relative isolation from the English speakers, they have their own schools. Of course if they interact across language border they likely use English as lingua franca. Which means that the bigger towns tend to be English speaking. As mass media rise, we don't see USA being dominated by one public broadcaster, so we see regional station broadcast in the local minority language. The dominance of English only end up dominate these states as increased urbanisation hits, but in rural areas people keep speaking their old languages.