National assimilation, which must of course be distinguished from the blending and turnover of races, with which it undergoes certain interactions, is a phenomenon whose historical significance cannot be assessed too highly. It is one manifestation of those forces whose operation shapes the history of peoples and states. We see it at work everywhere. If we could fully understand it in its conditions and in its essence, then we would have taken a good step further on the path that leads to understanding of historical development. In striking contrast to this importance of the problem is the disregard with which historical science and sociology have so far passed it by.
Language serves for intercourse with one's fellow men.
Whoever wants to speak with his fellow men and to understand what they say must use their language. Everyone must therefore strive to understand and speak the language of his environment. For that reason individuals and minorities adopt the language of the majority. Assimilation proceeds the faster the closer are the contacts of the minority with the majority and the weaker the contacts within the minority itself and the weaker its contacts with fellow nationals living at a distance. From that it immediately follows that the social positions of the different nationalities must be of special significance in this regard, for personal contacts are more or less bound up with class membership.