Q: How did increases in surpluses of food and specialized work help American Indian economies develop?
A: Increases in surpluses of food allowed American Indians to spend the time that is usually spent farming for food on other work, such as technological advancements in building, farming, military, and other branches.These specialized work allowed the technological advancement, which helped spur growth within the Indian communities and allowed them to be 'stronger'.
As the quote says: "Nothing would be more tiresome than eating and drinking if God had not made them a pleasure as well as a necessity." ~Voltaire
hope this helps