Slave life in the future US was downright easy living compared to the Caribbean and South America. The French, Spanish, and Portagooses were brutal to their slaves. On some of the islands, life expectancy was under 2 years.
A major problem for the early settlers was finding wives. In North America, they'd write home hoping their families could find them brides willing to come. Many women came as indentured servants or even prisoners. In S. American, they couldn't find enough women that way so they married their slaves, creating a largely mulatto population today.