This last and prominent boast of increased aggregate wealth in New England, over that accumulated by slaveholders, we will now test by the census of 1850. This is the standard adopted by our National Legislature for its decision.

Before we examine the facts, however, let a few reflections which belong to the subject be weighed.

The people of these five slave States are now, and ever have been, an agricultural people. The people of the New England States are a commercial and manufacturing people. New England has, in proportion to numbers, the richest and most extensive commerce in the world. In manufacturing skill and enterprise, they have no superiors on the globe. They have ever reproached the South for investing their income in slavelabor, in preference to commerce and manufactures. It has been the settled conviction among nations, that investments in commerce and manufactures give the greatest, and those in agriculture the smallest profits. It is the settled conviction of the non-slaveholding States that investments in slave labor, for agricultural purposes, is the worst of all investments, and tends greatly to lessen its profits. This has been proclaimed to the South so long by our Northern neighbors, that many here have been brought to believe it, and to regret the existence of slavery among us on that account, if on no other. With these observations we turn to the census.

The census of 1850 tells us that New England, with a population now numbering two million seven hundred, and twenty-eight thousand and sixteen, with all the advantages of a commercial and manufacturing investment, and with the most energetic and enterprising free men on earth, to give that investment its greatest productiveness, has accumulated wealth, in something over two hundred years, to the amount of one billion three million four hundred and sixty-six thousand one hundred and eighty-one dollars; while these five slave States, with an equal population, have, in the same time, accumulated wealth to the amount of one billion four hundred and twenty million nine hundred and eighty-nine thousand five hundred and seventy-three dollars.

Here we see the indisputable fact that these five agricultural States, with slavery, have accumulated an excess of aggregate wealth over the amount accumulated in New England in the same time, of four hundred and seventeen million five hundred and twenty-three thousand three hundred and two dollars—so that the property belonging to New England, if equally divided, would give to each citizen but three hundred and sixty-seven dollars, while that belonging to the five slave States, if equally divided, would give to each citizen the sum of five hundred and twenty dollars—a difference in favor of each citizen in these five slave States of one hundred and fifty-three dollars.

I am aware, however, of an opinion that some other non-slaveholding States, have been much more successful in the accumulation of wealth, than the six New England States, and that New York, Pennsylvania, and Ohio, are of this favored number. Lest a design to deceive, by concealing this supposed fact, should be attributed to the writer, we will see what the census says as to these three more favored States. By the census of 1850 we learn that New York, instead of being able to divide three hundred and sixty-seven dollars with her citizens, as New England could with hers, is only able to divide two hundred and thirty-one dollars; Pennsylvania two hundred and fourteen, and Ohio two hundred and nineteen. These several averages among freemen at the North, and in New England, stand against the average of five hundred and twenty dollars, which these five old impoverished Southern slave States could divide with their citizens.

These facts must astonish our Northern neighbors, so long accustomed to believe that slavery was the fruitful source of poverty, with all its imagined evils; and these facts will astonish many at the South, so long accustomed to hear it affirmed that slavery had produced these evils, and while they were without the means of knowing, of course they feared that it was so.

That every thing may appear, however, which will throw additional light on the subject, I will state that Massachusetts, which is the richest non-slaveholding State, could divide with each of her citizens five hundred and forty-eight dollars. But on the other hand, South Carolina could divide one thousand and one dollars, Louisiana eight hundred and six dollars, Mississippi seven hundred and two dollars, and Georgia six hundred and thirty-eight dollars, with their citizens.

Rhode Island, which is the next richest non-slaveholding State to that of Massachusetts, could divide with her citizens five hundred and twenty-six dollars; one other non-slaveholding State (Connecticut) could divide with her citizens three hundred and twenty-one dollars. After this, the next highest non-slaveholding State could divide two hundred and eighty; the next highest two hundred and thirty-one; the next highest two hundred and twenty-eight; the next highest two hundred and nineteen; the next highest two hundred and fourteen dollars. After this, the division ranges, among the non-slaveholding States, from one hundred and sixty-six down to one hundred and thirty-four dollars—which last sum is the amount that the so-called rich and prosperous Illinois could divide with her population.

In the slaveholding States that are less wealthy than South Carolina, Louisiana, Mississippi, and Georgia, already noticed; Alabama could divide with her citizens five hundred and eleven dollars; Maryland four hundred and twenty-three; Virginia four hundred and three; Kentucky three hundred and seventy-seven; and North Carolina three hundred and sixty-seven. All these States are much richer than the third richest non-slaveholding State of the Union, viz: Connecticut. After this, Tennessee could divide two hundred and forty-eight dollars, and Missouri, which is the poorest of all the slave States, one hundred and sixty-six dollars.