With a capital "R," Revolution refers to the American Revolution, from which many of the principles of the U.S. Constitution are drawn.

This speech is the only example in the entire Convention wherein a member of the proslavery South attempted to defend the institution of slavery on moral grounds, rather than merely pragmatic ones.  The logic of Pinckney’s argument can be broken down thus: since the best arbiter of moral right is the majority opinion of men throughout history, and history’s example gives approbation to the institution of slavery.  Dickenson will directly counter this historical argument later (paragraph 2762).  Whereas those who defended slavery had very narrow territory from which they could draw, those who denounced slavery on moral grounds drew from a larger arsenal: religion, natural rights of all men, consistency with the principles of the Revolution, compassion for a portion of suffering humanity, etc. 

Annotated by luzzell on September 05, 2013