Nationalities are a disease stemming from XIX century.
Oh Europe has allways been ready for it!
Sorry but no, Polish constitution was a direct reason behind such swift invasion, a country bordering three absolute monarchies suddenly comes up with a democratic constitution that stands against everything a lone tyrant represents.
Poland had to go because it got weak but it had to go
quickly because it was becoming democratic, Europe was definitely not ready for Poland.
Nationalities are a disease stemming from XIX century.
Everything depends on how you approach it, you can have national identity without force feeding others with it via armed invasion, to be a patriot doesnt always mean to be a nationalist.
In the exception of Germanic countries and Russia until now!
Both Russia and Germany were already dysfunctional nations but thats not the most important issue, the most important issue is that they were absolute monarchies, if you're a king you dont want your subjects getting funny ideas from this country just across the corner.
....and can you count Russia in on your side?
Without Russia thats about 90 milion, with Russia (just the European part) thats over a quarter of a bilion people.