The commerce of a free people is many times more valuable than that of slaves. Freemen produce and consume vastly more than slaves. They have therefore more to buy and more to sell. Hence the free states have a direct pecuniary interest in the civil freedom of all the other states. Commerce between free and slave states is not reciprocal or equal.
Lysander SpoonerThe purpose and effect of [land titles] have been to maintain, in the hands of robber, or slave holding class, a monopoly of all lands, and, as far as possible, of all other means of creating wealth; and thus to keep the great body of labourers in such a state of poverty and dependence, as would compel them to sell their labour to their tyrants for the lowest prices at which life could be sustained
Lysander SpoonerThe mental capacity of a person to make reasonable contracts, is the only criterion, by which to determine his legal capacity to make obligatory contracts. And his mental capacity to make reasonable contracts is certainly not to be determined by the fact that he is, or is not, twenty-one years of age.
Lysander Spooner