The USA is one of the largest producers of hazelnuts. Hazelnuts are used in snacks, baking and confectionery. They are also very popular in Spain in the famous dish called picadas. Macadamia Nuts are native to Australia even though Hawaii is now the leading grower. Macadamia nuts are used as snacks and in exotic dishes.
Peanuts are a legume and grow in the ground.
They are native to South America and are now cultivated in the United States, Africa, India, China and Indonesia. Peanuts are a popular snack and are also used to make cooking oil and peanut butter. They are also an ingredient in many Asian dishes. Pecans are native to North America where they are cultivated today. Pecans are used in ice cream, baking and as a topping or filling for some entree recipes.