Europe’s Baltic States, worried about invasive neighbours, are raising a fence along their eastern frontier. Meanwhile, in Asia, Chinese President Xi Jinping is calling for the building of an iron wall around the Xinjiang region. In Latin America, Ecuador appears to have begun erecting concrete panels along the Peruvian state line. In Africa, a barrier between Somalia and Kenya, made of barbed wire, concrete and posts, is nearing completion.
This is a far cry from the illusion generated by the fall of the Berlin Wall — and by the utopian dream of a world without borders that emerged in the 1990s.