For Mexicans, however, the effect of the law was complicated, as the quota system applied only to countries outside the "Western Hemisphere," meaning there were no caps on immigration from any Latin American country. This lack of a quota for Mexicans was controversial amongst the U.S. nativist movement, who were outraged at the large numbers of Mexican immigrants entering the country - including thousands during the Cristero War (1926-1929). Immigration restrictionists, who desired to limit the number of non-white people in the U.S., felt that immigration from Mexico, even when only to fill labor gaps, was dangerous to the nation. One article in the "The Saturday Evening Post" asked, “How much longer we going to defer putting the Mexican Indian under the quota law we have established for Europe?” The East Texas congressman John C. Box went so far as to state that Mexicans would lead to the “mongrelization” of white America. In general, however, Mexican racial identity was contentious enough for lawmakers to avoid moving forward with increased restrictions. U.S. Secretary of Labor James Davis, wrote, “The Mexican people are of such a mixed stock and individuals have such a limited knowledge of their racial composition that it would be impossible for the most learned and experienced ethnologist or anthropologist to classify or determine their racial origin. Thus, making an effort to exclude them from admission or citizenship because of their racial status is practically impossible.” According to scholars of the period, however, most Americans at the time believed Mexicans' racial heritage was "impure."