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The United States of America (USA), also known as the United States (U.S.), is a country located in North America. It is a federal republic of 50 states. The U.S. began as a collection of 13 British ...

A look at the top-trending stories in food, relationships, great outdoors and more.

Let your eyes wander to the areas of this map that deepen into red. They are the places in the lower 48 United States most likely to have plants and animals at high risk of global extinction.