>>24708450
>common government without a common language is a pipe dream
Switzerland and Belgium seem to have managed. In the Swiss case more than 60% speak German of course, but in Belgium there is an even division between the two main languages. Outside of Europe there are some interesting examples like India where Hindi is the first language of <45% of the population.
The EU is however much more fragmented with German being the first language of only about 20% of the population. The generations that grew up with the Internet will probably all speak English as a second language though, which might be good enough. It's much easier than constructing a new universal language from scratch and now that the UK is out of the union it's kinda like le olde Europeans speaking Latin between each other after Rome fell.