...They differed in this entirely from the imported slaves, who were both a burthen and a curse to themselves and others... 
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
... He had ever been a humane and indulgent master; one who lightened the burthen of the poor slave, all in his power...
Austin Steward 「Twenty-Two Years a Slave, and Forty Years a Freeman」
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