their voices heard through public lecturing. The National Negro Convention encouraged a boycott of slave-produced goods. These efforts were met with resistance, however, as the early 19th century brought renewed anti-black sentiment after the spirit of the Revolution began to die down. During the 1787 Philadelphia convention a compromise was proposed between northern states which only wanted to count free blacks in congressional apportionment (ignoring slave populations), and slave states which wanted full counting of the slave population. The compromise counted slave populations on the ratio of three-fifths, while free blacks were not subject to the compromise and counted as one full citizen for representation. Due to this compromise Southern states could count three-fifths of their slave populations toward the state populations for purposes of Congressional apportionment and the electoral college. This additional counting of the slave population resulted in those states having political power in excess of the white voting population. The South dominated the national government and the presidency for years. Congress adopted legislation that favored slaveholders, such as permitting slavery in territories as the nation began to expand to the West. The Fugitive Slave Act of 1793 was strengthened by the Fugitive Slave Act of 1850, part of the Compromise of 1850, requiring even the governments and residents of free states to enforce the capture and return of fugitive slaves. Famous fugitives such as Frederick Douglass and Sojourner Truth gained the support of white abolitionists to purchase their freedom, to avoid being captured and returned to the South and slavery. In 1857, the ruling of Dred Scott v. Sandford effectively denied citizenship to black people of any status. Southern states also passed harsh laws regulating the conduct of free blacks, in several cases banning them from entering or settling in the state. In Mississippi, a free Negro could be sold into slavery after spending ten days in state. Arkansas passed a law in 1859 that would have enslaved every free black person still present by 1860; although it was not enforced, it succeeded in reducing Arkansas's population of free blacks to below that of any other slave state. A number of Northern states also restricted the migration of free blacks, with the result that emancipated blacks had difficulty finding places to legally settle. The abolitionist cause attracted interracial support in the North during the antebellum years. Under President Abraham Lincoln, Congress passed several laws to aid blacks