The oldest known evidence of the domestication of potatoes is found in the North Creek Shelter Site in Utah’s Escalante Valley. Potato starch residues have been found on stone grinding tools, which are 10,900 years old. The type of potato is a species known as the Four Corners potato, which is native to the southwestern United States. The species is rarely found in today’s world except at archaeological sites. The Four Corners potato granules suggest that these ancient potatoes were an important component in the diet of our prehistoric ancestors. The tradition of potatoes as a favorite food continues in America today. The average American eats thirty pounds of French fries per year; however, on a per capita basis, Belgium consumes the most French fries in the world. Belgium also takes credit for inventing them.