The collision and the intermingling of these millions of foreign-born people representing so many races and creeds make New York a permanent exhibit of the phenomenon of one world. The citizens of New York are tolerant not only from disposition but from necessity. The city has to be tolerant, otherwise it would explode in a radioactive cloud of hate and rancor and bigotry. If the people were to depart even briefly from the peace of cosmopolitan intercourse, the town would blow up higher than a kite. In New York smolders every race problem there is, but the noticeable thing is not the problem but the inviolate truce.