Does a city on a hill need walls? Michael Shindler thinks it might. The issue of sovereignty, borders and the role of the nation-state is a fault line in libertarian circles today. As the world becomes smaller through globalization and international forms of governance, border politics captures the angst of the times and a young nation like the U.S.

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Follow Michael Shindler on Twitter @MichaelShindler

Read his latest in The American Conservative