The tribes of the League are usually classed in the so-called Woodlands culture area. They have, however, developed a civilization which is greatly specialized when compared with other tribes of that area, especially in social and political organization. The Iroquois exerted a powerful influence on some of their neighbors, notably on some of the eastern Algonkian tribes, whose socio-political organization bears unmistakable traces of Iroquois influence. The Iroquois of the League greatly developed a consciousness of what to-day might be designated as a historic mission. Their leaders believed that the Great Peace, for which the League stood, was fated to spread over all of the Indian tribes. In their attempts to induce other tribes to accept the principles of the League, they carried on an almost unceasing warfare against such tribes as the Neutrals, the Algonkians and the Sioux, and their combined forces proved irresistible to their less efficiently organized neighbors. Ultimately, they were checked in the south by their own relatives, the Cherokee.