Why did the one - third of the slaves die within three years on a plantation?

One-third of slaves on plantations died within three years primarily due to the harsh and inhumane conditions they faced, including exhausting labor, poor nutrition, and inadequate medical care. The brutal climate, exposure to diseases, and lack of proper sanitation also contributed to high mortality rates. Additionally, the psychological trauma and physical abuse inflicted by the plantation system exacerbated their suffering and decreased their chances of survival.