We now come to the most important element of all. In any well ordered democratic country there must be a high degree of unity in both the thought and feeling of the people. There is a principle of mechanics involved here. If the machine is to run at all, its parts must function together properly. If it is to run smoothly, without mishap of any sort, then those parts must have been most carefully fitted and adjusted together. If a population is seriously divided along lines of race, language, religion, or social classes, in just so far is a working democracy made difficult. Given enough differences and the machine breaks down. For instance, Switzerland is often cited as a country where democracy works even though the people are divided into three language groups. Nothing is more untrue. In Switzerland the entire population is united because almost everybody uses two or three languages in common instead of one. Religious differences among the Swiss are not dangerous to democracy because church and state are completely separated, and it is taken for granted that no church shall meddle in the slightest degree in political affairs. Any larger disunity robs a nation of its hope of democracy. Witness the peculiar failure in the democratic effort in Russia, where the fanatical sect of Bolsheviki has set up a dictatorship in the name of the wage-working class alone. What a lesson can be learned from Poland, where religious difficulties have recently resulted in bloody riots; or in Italy, where Nationalists, Socialists, Communists and Catholics, each organized into a party, have recently gone out seeking the blood of one or more of the opponents. In this the famous words of Lincoln forever come into mind. "A house divided against itself can not stand. This nation can not endure half slave and half free. It will be all the one thing or all the other." Democracy in America has been successful hitherto because we have been enabled, first and last, at whatever sacrifices, to preserve our national unity. [Illustration: THE OATH OF ALLEGIANCE Where Country, Our Home, The Klan and Each Other are Secured] Democracy is limited to those nations whose citizens possess these peculiar and lofty qualifications of mind and character. It is limited to nations which are blessed with unity and solidarity among its people. It is further limited to nations which have grown into the practice of democracy during long experience. Instead of asking what nations and peoples are likely to fail at democracy, we had better start by inquiring as to what few nations are fortunate enough to possess all of these qualifications which, taken together, make democracy possible.