Areason why slavery developed in the american colonies was indentured servants became slaves after seven years. southern plantation owners needed more labor at lower costs. indentured servants no longer wanted to come to the colonies. new england farmers needed a lot of with their cash crops.

The correct answer is B) southern plantation owners needed more labor at lower costs.

A reason why slavery developed in the American colonies was that southern plantation owners needed more labor at lower costs.

Wealthy southern landowners owned large plantations that needed extra hands to do the hard work. That is why they favored slavery. Indeed the southern economy depended so much on slavery to produce the right cash crops that could be traded and exported to Europe. Plantation owners bought African slaves and put them to work in the farm fields at almost no cost.

he believed that strong monarchies would lead to social and political stability.