It is the maintenance of slavery by law in a state, not parallels of latitude, that makes its a southern state; and the absence of this, that makes it a northern state.
William H. SewardThe right to have a slave implies the right in some one to make the slave; that right must be equal and mutual, and this would resolve society into a state of perpetual war.
William H. SewardThe two systems slave and free-labor are incompatible. They have never permanently existed together in one country, and they never can.
William H. SewardThere is not only no free state which would now establish it, but there is no slave state, which, if it had had the free alternative as we now have, would have founded slavery.
William H. Seward