Final answer:
Labor shortages and the inefficiency of indentured servitude in the Middle Colonies led to an increase in the African slave trade, providing a more stable and profitable labor source for tobacco plantation owners like Martha.
Step-by-step explanation:
Situations such as Martha's, who lived in the Middle Colonies and owned a large tobacco plantation, could have led to an increase in the African slave trade. As indentured servitude proved insufficient due to high mortality rates, harsh treatment, and short-term contracts, the colonies turned to a more permanent solution for their labor shortages. The transformation from indentured servitude to slavery happened first in the West Indies and soon was adopted in the Chesapeake colonies, with slave labor becoming a dominant force in the economic growth and agricultural production of tobacco and other crops.
With tobacco being a labor-intensive crop and the prospects of wealth from land ownership, the need for a stable workforce became critical. Colonists like Martha often faced labor shortages during harvest seasons when other colonists were tending to their fields, and indentured servants, who were temporary laborers, were not able to fill this vacuum. Ultimately, this led to the sinister and profitable option of slave trade and ownership as a means to ensure a consistent and controlled labor force for plantations.