A strong network of navigable rivers allows people and products to be easily and cheaply moved across the nation and around the world.The chain of barrier islands along the US coast provide a navigable coastal route from the Rio Grande to the Chesapeake Bay, which allows products coming down the Mississippi to be distributed easily and cheaply to the Gulf and East Coasts.The western great plains offer the largest tract of fertile agricultural lands in the world.The west coast is easily navigable and allowed for global trade from the far east.

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