Final answer:
Rum was not produced in the West Indies before European colonization because the cultivation of sugarcane, a primary ingredient in rum, was introduced by European merchants who used enslaved Africans to work on sugar plantations. The molasses, a by-product of sugar production, could then be distilled into rum.
Step-by-step explanation:
Rum was not produced before European colonization of the West Indies because the cultivation of sugarcane, which is a primary ingredient in rum production, was developed in the Caribbean as a result of European involvement. European merchants established sugar plantations in the New World using enslaved people from West Africa to work on these plantations and produce sugar. The molasses, a by-product of sugar production, could then be distilled into rum.