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Borders are perhaps the biggest and most contentious issue when it comes to trade, immigration, diplomacy, and innovation. Twenty years after NAFTA and with the Trans-Pacific Partnership on the horizon, it’s time to update the United States’ border-sharing relationships with its neighbors. One provocative way to start the conversation: Let’s create a North American passport, say Andres Martinez and Daniel Kurtz-Phelan in this conversation with Anne-Marie Slaughter (and in Â鶹¹û¶³´«Ã½’s ). Martinez and Kurtz-Phelan point out that the privileges of movement and access shared among the United States, Canada, and Mexico should reflect just how interwoven our respective economies–including education, manufacturing, and research, in addition to trade itself–have become.