Europe's migration crisis is exposing the deep divisions that exist within the European Union, which European federalists have long hailed as a model for post-nationalism and global citizenship. Faced with an avalanche of migrants, a growing number of EU member states have moved decisively to put their own national interests above notions of EU solidarity.

Hungary's parliament, for instance, has approved the construction of a massive border fence with Serbia as part of a new anti-immigration law that also tightens asylum rules.

The move is aimed at stopping tens of thousands of migrants from Africa, Asia and the Middle East from entering Hungary, which has become a key gateway for illegal immigration into the European Union.

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