Answer:
there was an uncertain supply of workers
Step-by-step explanation:
The plantation economy blossomed in Southern America and because of this, Southern plantation owners were in need of more laborers. They resorted to "indentured servants." These servants were tied to help in the plantation for 5 to 7 years and after which, they'd already be set free. In exchange, they'd be given shelter, food and clothing. However, most of the servants didn't survive long enough to complete their contract. Many died because of diseases while others suffered under very cruel masters. It was also hard to form families because of a huge ratio gap between men and women. This decreased the population of the indentured servants and created an uncertain supply of workers.