expatiate on its disadvantages. I think it however a greater evil to the white man than to the black race, & while my feelings are strongly enlisted in behalf of the latter, my sympathies are more strong for the former. The blacks are immeasurably better off here than in Africa, morally, socially & physically. The painful discipline they are undergoing, is necessary for their instruction as a race, & I hope will prepare & lead them to better things. How long their subjugation may be necessary is known & ordered by a wise Merciful Providence. Before leaving to serve in Mexico, Lee had written a will providing for the manumission of the slaves he owned, "a woman and her children inherited from his mother and apparently leased to his father-in-law and later sold to him." Lee's father-in-law, G. W. Parke Custis, was a member of the American Colonization Society, which was formed to gradually end slavery by establishing a free republic in Liberia for African-Americans, and Lee assisted several ex-slaves to emigrate there. Also, according to historian Richard B. McCaslin, Lee was a gradual emancipationist, denouncing extremist proposals for the immediate abolition of slavery. Lee rejected what he called evilly motivated political passion, fearing a civil and servile war from precipitous emancipation. Historian Elizabeth Brown Pryor offered an alternative interpretation of Lee's voluntary manumission of slaves in his will, and assisting slaves to a life of freedom in Liberia, seeing Lee as conforming to a "primacy of slave law". She wrote that Lee's private views on race and slavery, "which today seem startling, were entirely unremarkable in Lee's world. No visionary, Lee nearly always tried to conform to accepted opinions. His assessment of black inferiority, of the necessity of racial stratification, the primacy of slave law, and even a divine sanction for it all, was in keeping with the prevailing views of other moderate slaveholders and a good many prominent Northerners." In 1857, George Custis died, leaving Robert Lee as the executor of his estate, which included nearly 200 slaves. In his will, Custis stated the slaves were to be freed within five years of his death. On taking on the role of administrator for the Parke Custis will, Lee used a provision to retain them in slavery to produce income for the estate to retire debt. Lee did not welcome the role of planter while administering the Custis properties