The old "Liberty party," however, grew gradually into the larger and more powerful "Free Soil" party, of which the venerable John Quincy Adams became the champion in the House of Representatives, and Martin Van Buren the presidential candidate in 1848. It was still, of course, a small minority, but its influence was now distinctly felt in the legislative councils and in the politics of the country. The petitions in favor of abolition which invaded Congress created alarm in the South, and at last the southern members found it necessary to pass a rule excluding these "incendiary documents" altogether. [Sidenote: The Compromise of 1850.] If the Free Soilers were becoming formidable, the South was also resolved to assume the offensive. Its triumph in securing the annexation of Texas as another slave State was followed, a few years after, by the celebrated "Compromise" of 1850; by which, while California was admitted as a free State, and the slave trade was abolished in the District of Columbia, the Fugitive Slave Law was also conceded. This aroused the indignation of very large numbers in the North, and the treatment of fugitives under it, notably that of Jerry in New York State, and of Anthony Burns in Boston, did much to develop and strengthen the anti-slavery feeling. The outrageous character of the law was too palpable to be unperceived and unresented. [Sidenote: The Free Sellers.] [Sidenote: Border Ruffianism.] The next effort of the slave power provoked the formation of a great national anti-slavery party, out of the old Free Soil elements. This effort, which, by the aid of the Pierce administration and some Northern statesmen, was successful, was to destroy the Missouri Compromise of 1820 and thus open the way to the creation of slave States north, as well as south, of Mason and Dixon's line. The immediate object of this policy was to make slave States of Kansas and Nebraska, two great territories which were ready for admission into the fatuity of the Union. No sooner had the Nebraska Bill passed, in May, 1854, than the terrible scenes of "border ruffianism" began. As the new law required that the inhabitants of the territories should themselves decide whether slavery should exist or not, the attempt was made to convert Kansas into a slave State by invasions of "border ruffians" from Missouri. After a long and bloody struggle, the cause of freedom triumphed in the two disputed territories. [Sidenote: The "Irrepressible Conflict."]