By table 35 of the census, p. 195, the whole value of all the property, real and personal, of Massachusetts, in 1860, was $815,237,433, and of Maryland, $376,919,944. We have seen that the value of the products that year in Massachusetts was $283,000,000 (exclusive of commerce), and of Maryland, $65,583,000. As a question, then, of profit on capital, that of Massachusetts was 34 per cent., and of Maryland 17 per cent. Such is the progressive advance (two to one) of free as compared with slave labor. The same law obtains in comparing all the free with all the slave States. But the proof is still more complete. Thus, Delaware and Missouri (alone of all the slave States) were ahead of Maryland in this rate of profit, because both had comparatively fewer slaves; and all the other slave States, whose servile population was relatively larger than that of Maryland, were below her in the rate of profit. The law extends to _counties_, those having comparatively fewest slaves increasing far more rapidly in wealth and population. This, then, is the formula as to the rate of profit on capital. First, the free States; next the States and counties of the same State having the fewest relative number of slaves. The census, then, is an evangel against slavery, and its tables are revelations proclaiming laws as divine as those written by the finger of God at Mount Sinai on the tables of stone.
For seventy years we have had these census tables, announcing these great truths more and more clearly at each decade. They are the records of the nation's movement and condition, the decennial monuments marking her steps in the path of empire, the oracles of her destiny. They are prophecies, for each decade fulfils the predictions of its predecessor. They announce laws, not made by man, but the irrevocable ordinances of the Almighty. We cannot, with impunity, refuse to obey these laws. For every violation, they enforce their own penalties. From these there is no escape in the present or the past, nor for the future, except in conformity to their demands. These laws condemn slavery; and the punishment for disobedience is recorded in the result of every census, and finally culminated in the rebellion. Slavery and freedom are antagonistic and discordant elements: the conflict between them is upon us; it admits of no neutrality or compromise, and one or the other system must perish.