It must be observed, however, that the social boundaries of races are not coincident with the divisions of language. In general the tendency is for a race to develop an independent language, for racial development was dependent upon isolation from other groups. But from the very earliest associations to the present time there has been a tendency for assimilation of groups even to the extent of direct amalgamation of those occupying contiguous territory, or through conquest. In the latter event, the conquered group usually took the language of the conquerors, although this has not always followed, as eventually the stronger language becomes the more important {125} through use. For instance, for a time after the Norman Conquest, Norman French became, in the centres of government and culture at least, the dominant language, but eventually was thrown aside by a more useful language as English institutions came to the front. As race and language may not represent identical groups, it is evident that a classification of language cannot be taken as conclusive evidence in the classification of races. However, in the main it is true. A classification of all of the languages of the Indians of North America would be a classification of all the tribes that have been differentiated in physical structure and other racial traits, as well as of habits and customs. Yet a tribe using a common language may be composed of a number of racial elements. When it comes to the modern state, language does not coincide with natural boundaries. Thus, in Switzerland German is spoken in the north and northeast, French in the southwest, and Italian in the southeast. However, in this case, German is the dominant language taught in schools and used largely in literature. Also, in Belgium, where one part of the people speak Flemish and the other French, they are living under the same national unity so far as government is concerned, although there have always remained distinctive racial types. In Mexico there are a number of tribes that, though using the dominant Spanish language, called Mexican, are in their closer associations speaking the primitive languages of their race or tribe which have come down to them through long ages of development. Sometimes, however, a tribe shows to be a mosaic of racial traits and languages, brought about by the complete amalgamation of tribes. A very good example of this complete amalgamation would be that of the Hopi Indians of New Mexico, where distinctive group words and racial traits may be traced to three different tribes. But to refer to a more complete civilization, where the Spanish language is spoken in Spain, we find the elements of Latin, Teutonic, Arabic, and Old Iberian speech, which are suggestive of different racial traits pointing to different racial origins. {126}