The right of revolution is an inherent one. When people are oppressed by their government, it is a natural right they enjoy to relieve themselves of oppression, if they are strong enough, whether by withdrawal from it, or by overthrowing it and substituting a government more acceptable.
I never was an Abolitionest, not even what could be called anti slavery, but I try to judge farely and honestly and it become patent to my mind early in the rebellion that the North and South could never live at peace with each other except as one nation, and that without Slavery.
Ulysses S. Grant (1822 - 1885)
Source: Letter to Elihu B. Washburne, August 30, 1863