Rice became an important crop in America during the 18th century. In the Carolinas it became farmer's main source of income and by the 19th century it became a significant crop in Virginia and Georgia. Rice was labour intensive and large numbers of slaves were purchased to do this work. They were also used for the construction of canals and ditches to maintain adequate supplies of water.
MacPherson was an overseer where slaves were employed in cutting canals. The labour there is very severe. The ground is often very boggy: the negroes are up to the middle or much deeper in mud and water, cutting away roots and baling out mud: if they can keep their heads above water, they work on. They lodge in huts, or as they are called camps, made of shingles or boards. They lie down in the mud which has adhered to them, making a great fire to dry themselves, and keep off the cold. No bedding whatever is allowed them; it is only by work done over his task, that any of them can get a blanket. They are paid nothing except for this overwork. Their masters come once a month to receive the money for their labour: then perhaps some few very good masters will give them two dollars each, some others one dollar, some a pound of tobacco, and some nothing at all. The food is more abundant than that of field slaves; indeed it is the best allowance in America: it consists of a peck of meal, and six pounds of pork per week; the pork is commonly not good, it is damaged, and is bought as cheap as possible at auctions.