It would have to be distinguished by a particulary specific 'racial spectrum' sharply differentiated from the 'racial' nature of its neighbors.

It would have to inhabit, from time immemorial, a territory with clear-cut frontiers, preferably an island; and that territory to harbor all the members of the nation so that there would be no scattered minorities abroad. It would still be better if there were no alien minorities on the nation's territory.

It should speak a language entirely unlike that of any neighbor across any frontier; better still, a language unlike any other in the world; a language created by the nation itself and reflecting all phases of its thought and emotion.

It should practice a national religion, not a borrowed one like Islam in Persia, but one of its own devising from the earliest times such as Buddhism in India or Judaism of the jews.

An finally, it should possess a historic unbroken tradition common to all its parts from remotest antiquity.

Jabotinsky, Vladimir, Race and nationality (Russian 1911, English 1939), zitiert in Rabinowicz, Oskar K.,  Wladimir Jabotinsky's conception of a nation, New York : Beechhurst Press, 1946, S. 28 f.