They mostly grew wheat, barley, oats, rye, and corn. because of this, they were basically known as the "Breadbasket". So I believe your answer would most likely be wheat.
Bankers because they have to be the opposed
Europeans, mainly the English and the French began trading with the Native Americans as early as the 16th century. The demand for fur was rising in Europe so the Europeans traded knives, guns and axes in return for animal pelts and furs from the Native Americans.
