Borders aren't just lines on a map, but clearly defined countries and territories with sometimes messy stories. From Greenland and Alberta to the South China Sea, Cyprus and Kaliningrad, their histories reveal why territorial disputes continue to shape politics and identity. Genevieve Woo joins Senior Editor Liling Tan and Correspondent Nick Harper to explore the deeper question of who actually holds the pen, and what it takes to make a boundary stick. 

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