What’s the deal with Brexit ?

What actually matters with Brexit might no be the (no-)deal born from May’s government negotiations but rather the long-term issues that led to Brexit in the first place and will continue to agitate Britain politics for the next decades.

Have most British voters voted according to domestic concerns rather than strictly European questions ? Has British multiculturalism model fueled nationalism and racism, especially against center Europeans ? To what extent can Brexit be perceived as a crisis of democracy, of sovereignty, of identity – or everything altogether ?

What do you think is the main reason Brexit happened in the first place, and what could be the new geopolitical expression of a post-EU Britain ?