"Of the over twelve million Africans forced into the trans-Atlantic slave trade from the sixteenth to the nineteenth centuries, only four percent – roughly 470,000 men, women, and children – were sent to North America. The overwhelming majority of enslaved Africans in the trans-Atlantic slave trade went to sugar plantations in the Caribbean and Brazil. This significant difference in trade numbers stems from various factors, particularly contrasting mortality and reproduction rates for enslaved populations in different regions." -- Lowcountry Digital History Initiative: A Digital History Project hosted by the Lowcountry Digital Library at the College of Charleston
The average life span of U.S. slaves was 30 years. The average lifespan for South American slaves was 10 years, due to extremely poor treatment.