From the Covid-19 pandemic to the migration crisis, from terrorism to Brexit and tensions between the US and Mexico, conflicts around the world all have one thing in common: borders. But are they designed to protect or provoke? Bruno Tertrais, deputy director at the French think tank Foundation for Strategic Research, has studied borders around the world and put together a book mapping out those dividing lines. He brings us his perspective on the use and abuse of Earth's frontiers.

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