“The white slave had taken from him by indirection what the black slave had taken from him directly and without ceremony. Both were plundered, and by the same plunderers. The slave was robbed by his master of all his earnings, above what was required for his bare physical necessities, and the white laboring man was robbed by the slave system, of the just results of his labor, because he was flung into competition with a class of laborers who worked without wages. The slaveholders blinded them to this competition by keeping alive their prejudice against the slaves as men--not against them as slaves.”