By the universal admission of all persons, whatever were their sentiments or feelings concerning slavery, the Constitution of the United States conferred no power upon Congress to act on it in any State of the Union. This was as much acknowledged by the early abolitionists as by all other men. They regarded the Constitution as a “pro-slavery” instrument. They admitted that the supreme law of the land recognized and to a certain extent upheld the principle that slaves were property; and they therefore sought for a justification of their attacks upon the Constitution in what they denominated the “higher law,” which meant that when the individual citizen believes that the moral law is in conflict with the law of the land, the latter cannot rightfully bind his conscience or restrain his conduct. Proclaiming it to be sinful to live in a political confederacy which tolerated slavery anywhere within its limits, they began by denouncing the Constitution as a “league with death and a covenant with hell;” and it was not long before this doctrine of the higher law was preached from pulpits and disseminated by numerous publications in the New England States. The dates of the organized anti-slavery societies are important to be observed, because of the spontaneous movement in Virginia towards the removal of slavery which shortly preceded them. The New England Anti-slavery Society was organized in Boston, on the 30th of January, 1832; the New York Society in October, 1833; and the National Society at Philadelphia in December, 1833. Affiliated local societies of the same kind sprang up at once in many towns and villages of the North. At the time when these organizations were first gathered, and for a long period thereafter, there was no pending question upon the subject of the extension of slavery into Territories of the United States. The country had been reposing since 1820 upon the Missouri settlement; it was not until 1845 that any addition of slave territory was threatened; and at the moment when the first anti-slavery society was organized in Boston, Virginia was on the verge of emancipating her slaves. Accordingly, the nature, purposes and methods of the Northern anti-slavery agitation between the year 1832 and the annexation of Texas in 1845, and thence to the year 1860, form a most important subject of political study.