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It is official now. The United Kingdom has invoked Article 50 of the Lisbon Treaty and will leave the European Union. Don’t take it lightly -- this is not fake news, this is a historic event which will change Europe and your own situation dramatically. Disintegration of the continent is moving at full speed and it will generate many losers.

You may not feel it yet, but life will be harder for a long time before it will get any better. The damage is largely self-inflicted; thanks to poor political craftsmanship on the two sides of the English Channel. It did not need to be this way. This is the irony of the current predicament.

Jan Zielonka ist Professor für Europäische Politik in Oxford und Ralf Dahrendorf Fellow am St. Antony's College. ©Tadeusz Późniak/Polityka

I look at Brexit as an academic and as a citizen. As an academic I feel fairly happy: Brexit is a fascinating case to study and it increases the audience for my work. As a citizen, however, I feel deeply unhappy. I grew up in Silesia, behind the Iron Curtain, and a Europe without borders was my dream. Today this dream is being destroyed; I don’t want to see new walls, beg immigration officers for a visa; apply for a work permit in a Europe which I consider my home.

Although I have worked and paid taxes in the United Kingdom for many years already, I am still a Polish national, hold a Dutch passport, and own a house in Italy. My family is spread across the continent and so are my pension contributions. Access to both will be much harder for me after Brexit. I wonder whether any official will help me to sort out personal problems caused by new walls erected throughout the continent.

You may think that Brexit will affect only nomads like me, and not settlers like you, perhaps. You did not plan to go on holidays to rainy Britain, so why bother? Make no mistake: Brexit will not be an amicable divorce and it will have implications for everybody. It is not easy to untangle 20.000 laws and regulations of the European acquis; there are numerous veto players on both sides of the negotiating table; and under the glare of the media emotions will play a greater role than rational calculations in the process of bargaining.

This time Uncle Sam won’t be there to bring us all to our senses; Uncle Trump is likely to add to our complications. Brexit will create new dividing lines within the EU; the UK is already trying to bribe Poland and Hungary to help its case. Brexit will also create new dividing lines within the United Kingdom; Scotland already demands a new independence referendum. I would not be surprised if both negotiating partners – the EU and the UK –fall apart as a result of Brexit.

The idea that Brexit may well be good for the EU is absurd. "We would finally be able to create a truly European defence after Brexit," an Italian diplomat recently whispered to me. Sure, we just lost one of the two serious European armies, was my reply. A new building in Brussels does not amount to a European defence. With whom will we create a European army, with the Czechs and Belgians?

Nor can I see more stringent European regulation of the financial sector after neo-liberal Britain leaves the single market. The government in Rome is already trying to charm London-based billionaires to move to Italy by offering tax exemptions. Others will soon follow suit. This will be an economic race to the bottom, not to the top.