We turn now to a closer study of the life conditions of the immigrants after they have been admitted to this country, and have become a part of our body politic. These conditions affect all the life interests of the alien, and must, in the end, have a determining influence upon the desirability of immigration, both from the point of view of the immigrant and of the United States. They are manifestly so diverse and complicated as to make it difficult to frame any classification which will not overlap, and confuse rather than clarify. In general, however, we may divide these conditions into two categories, which are not absolutely exclusive and definite, but will serve the purposes of arrangement. These are as follows: (1) Those conditions which are primarily individual to the immigrant himself, and affect the general life of the nation only indirectly, because the immigrant is a resident of that nation. (2) Those conditions which have to do directly with the life of the immigrant as a member of society, and immediately affect the interests and welfare of others besides himself. To the first category belong such matters as housing conditions, food, and standard of living in general, wages, recreations, religious life, certain forms of vice, education, etc. To the second, pauperism, crime, sex vice, insanity, contagious diseases, industrial efficiency, trade-union affiliations, political activities and affiliations, money brought into and sent out of the country, and anything which increases or lightens the burdens of the average citizen of the country. In each of these two classes, there are conditions which may be considered as political, religious, economic, and social. Many life interests belong partly in one category, and partly in the other. This is especially true of that great class of facts having to do with marriages, births, and deaths, which affect first of all the immigrant, but through him the general population of the country. Among those conditions which are primarily individual, many of the most important come under the head of the economic. And many of the most significant economic conditions may be considered under the head of the standard of living. It has been said, with a great deal of truth, that the immigration problem in this country is largely a matter of a competitive struggle between different standards of living.