These runaways and the freedmen of the North soon began to form a group of people who sought to consider the problem of slavery and the destiny of the Negro in America. They passed through many psychological changes of attitude in the years from 1700 to 1850. At first, in the early part of the eighteenth century, there was but one thought: revolt and revenge. The development of the latter half of the century brought an attitude of hope and adjustment and emphasized the differences between the slave and the free Negro. The first part of the nineteenth century brought two movements: among the free Negroes an effort at self-development and protection through organization; among slaves and recent fugitives a distinct reversion to the older idea of revolt. As the new industrial slavery, following the rise of the cotton kingdom, began to press harder, a period of storm and stress ensued in the black world, and in 1829 came the first full-voiced, almost hysterical protest of a Negro against slavery and the color line in David Walker's Appeal, which aroused Southern legislatures to action. The decade 1830-40 was a severe period of trial. Not only were the chains of slavery tighter in the South, but in the North the free Negro was beginning to feel the ostracism and competition of white workingmen, native and foreign. In Philadelphia, between 1829 and 1849, six mobs of hoodlums and foreigners murdered and maltreated Negroes. In the Middle West harsh black laws which had been enacted in earlier days were hauled from their hiding places and put into effect. No Negro was allowed to settle in Ohio unless he gave bond within twenty days to the amount of five thousand dollars to guarantee his good behavior and support. Harboring or concealing fugitives was heavily fined, and no Negro could give evidence in any case where a white man was party. These laws began to be enforced in 1829 and for three days riots went on in Cincinnati and Negroes were shot and killed. Aroused, the Negroes sent a deputation to Canada where they were offered asylum. Fully two thousand migrated from Ohio. Later large numbers from other parts of the United States joined them. In 1830-31 the first Negro conventions were called in Philadelphia to consider the desperate condition of the Negro population, and in 1833 the convention met again and local societies were formed. The first Negro paper was issued in New York in 1827, while later emancipation in the British West Indies brought some cheer in the darkness.