Answer: Indians cultivated and developed many plants that are very important in the world today. Some of them are white and sweet potatoes, corn, beans, tobacco, chocolate, peanuts, cotton, rubber and gum. Plants were also used for dyes, medicines, soap, clothes, shelters and baskets.
The answer is old and nasty
They kept a deal with the lower part of America to give their runaway slaves back if they ran into the upper part of America without a single question
Maybe churches and cathedrals, but I'm not sure if that's considered institutions.
