But the general acquiescence in the objects of the Colonization Society did not long continue. The exports of cotton from the South were then rapidly on the increase. Slave labor had become profitable, and slaves, in the cotton-growing States, were no longer considered a burden. Seven years after the first emigrants reached Liberia, the South exported 294,310,115 lbs. of cotton; and, the year following, the total cotton crop reached 325,000,000 lbs. But a great depression in prices had occurred,[7] and alarmed the planters for their safety. They had decided against emancipation, and now to have their slaves rendered valueless, was an evil they were determined to avert. The Report of the Boston Prison Discipline Society, which appeared at this moment, was well calculated, by the disclosures it made, to increase the alarm in the South, and to confirm slaveholders in their belief of the dangers of emancipation.
At this juncture, a warfare against colonization was commenced at the South, and it was pronounced an abolition scheme in disguise. In defending itself, the society re-asserted its principles of neutrality in relation to slavery, and that it had only in view the colonization of the free colored people. In the heat of the contest, the South were reminded of their former sentiments in relation to the whole colored population, and that colonization merely proposed removing one division of a people they had pronounced a public burden.[8]
The emancipationists at the North had only lent their aid to colonization in the hope that it would prove an able auxiliary to abolition; but when the society declared its unalterable purpose to adhere to its original position of neutrality, they withdrew their support, and commenced hostilities against it. "The Anti-Slavery Society," said a distinguished abolitionist, "began with a declaration of war against the Colonization Society."[9] This feeling of hostility was greatly increased by the action of the abolitionists of England. The doctrine of "Immediate, not Gradual Abolition," was announced by them as their creed; and the anti-slavery men of the United States adopted it as the basis of their action. Its success in the English Parliament, in procuring the passage of the Act for West India emancipation, in 1833, gave a great impulse to the abolition cause in the United States.