The major effect was a dramatic reduction in the male population, since male slaves bought a higher price than females. African tribes often raided each other with no intention other than that of providing captives to be sold into the slave market. Roughly two thirds of those sold into slavery were young males between the ages of fourteen and thirty five. The result was a tremendous gender imbalance, with substantially more females than males. As a result, women were forced to perform chores previously performed by men, and in some instances, polygamy became standard practice. Warfare between tribes and factions was exacerbated because slave traders often traded firearms for slaves. Conflict between areas frequently broke out which never would have occurred were it not for the introduction of guns by way of the slave trade.