The facts do not support this idea at all. And a very slight consideration of the conditions discloses the reasons. In the first place, no knowledge of English whatever is required for the declaration of intention; and only the statistics of full naturalization are of value in this matter. Both the statistics of the Immigration Commission, and especially those compiled by the Americanization Study, make it clear that, on the average, more than ten years’ residence in this country precedes final naturalization. It is a rare case in which during that ten years the petitioner has not acquired a speaking knowledge of English sufficient for all his practical purposes. The statistics of the Immigration Commission themselves show how little the original knowledge of English has to do with the matter.[109] For the persons from whom the Commission got information, who had been in this country ten years or over (racial groups represented by 100 individuals or more), the percentages of those fully naturalized exhibit the fact that the Swedish and German show a higher rate than the Irish; the Bohemian, Moravian, Norwegian and Danish outrank the Scotch, Welsh, and English. Even for those who have been in the country only five to nine years the Swedes show the highest percentage.[110] That length of residence, rather than native language, is the dominant factor in determining interest in citizenship, stands forth in Table VIII, which gives percentages by race of those in the United States ten years or longer, and of such of these as have been fully naturalized. LENGTH OF RESIDENCE AND EARNING POWER The fallacious nature of the assumption that there is an essential difference between the so-called “older” and “newer” races as such in respect of interest in citizenship is further disclosed by the statistics of the Immigration Commission on the subject of the wages of foreign-born laborers. The Commission found that the members of the “older” races in the households covered by its inquiry were earning more than those of the “newer” races, and occupied, generally speaking, higher positions. This, of course, was to be expected; but little stress was laid by the Commission upon the relation between these facts and the relative rates of naturalization, although it is a conspicuous relationship. Like most of the statistics compiled by the Commission in this particular field, the comparison may be criticized on the ground that the numbers upon which percentages are based and compared are small, and differ widely among the racial groups. Nevertheless, despite this discrepancy, the probability stands forth that, in addition to length of residence, the economic status--the individual and family income--is a most important factor in determining the interest of the foreign born in acquiring citizenship. From the following table it is clear that the “older” races show a higher average rate of income in all the occupations listed than the “newer.”[111] TABLE XI