POD here is 1989.
Post-George H.W. Bush presidency, a mass exodus of Americans fleeing to Europe due to dissatisfaction with the Bush administration.
The Netherlands, Italy, Spain, United Kingdom, Austria, Sweden, Denmark, Finland, Portugal, Belgium, Republic of Ireland all face a lot of Americans actually carrying out their threat to move their permanently.
Like a refugee crisis, but here, it's down to dissatisfaction with the U.S. since the days of Gerald Ford.
Large American enclaves in some cities and clashes between the locals and Americans.
Note, since current politics isn't allowed, I've gone with 1989.
However, ITTL, support for Scottish independence remains low; IRA leaders threaten George H.W. Bush publically on television.
Also, ITTL, South Tyrol in Italy seeks to rejoin Austria and feel cultural affinity with Austrian culture as compared to Italian; maybe a few terrorist acts for their cause.
In March 1990, Brøndby Strand, Copenhagen; a man shoots his girlfriend, a shop worker and two men in a shop, apparently ranting about the European Community and wanting Denmark to leave the EU, he claims "Danmark skal forlade Den Europæiske Union, vi er en nation, der bør forblive på egen hånd! Den Europæiske Union er narre, der fortjener at gå til helvede! Fuck dig! (in Danish, Denmark should leave the EU and are fools).
July 1990: Dutch government corruption scandal exposed with something relating to kickbacks and prostitution.
September 1990: Tyrol, Austria; Man shoots protestor who crosses over the border protesting about how South Tyrol should join Austria; review of gun laws.
October - November 1990: Conflict between Americans and Spanish in Barcelona, with rioting going on for several days.
January 1991: Anti-EU protests begin in Italy, calling for Italy to leave the EU and fights break out in the streets.
March 1991: Ford cars held up in port in Italy by Greenpeace protestors (the vehicles are Mustang V8 and Explorer SUVs)
April 1991: Ferrari plant blockaded by Greenpeace protestors who feel they are damaging the environment.
June 1991: Riots in London, England; Chicago, Illinois; Madrid, Spain; Berlin, Germany; protesting about issues in their country.
September 1991: Naho Tabata, a 25-year-old, Japanese expatriate in Rome, Italy is murdered by xenophobic rioters
November 1991: Indo-Canadian man, Viswamitra Dheer, an expat in Rome, beaten by xenophobic rioters in Italy who want Indians to leave the country.
Is this the sort of timeline you were expecting?