Inside America's Most Complicated Coastline

Look closely at a map of Alaska, like really close. It has this jagged tail awkwardly hugging the Canadian coastline. In many ways, it looks like a map error. But this tiny strip of land is actually a massive rainforest that sparked a fierce border dispute, completely locking Canada out of the Pacific Ocean. So why does the United States own it today and, more importantly, why do more than 70,000 people call this dreary isolated region home today?