[单项选择]In this new era, the single most immediate and most serious challenge to America traditional identity comes from the immense and continuing immigration from Latin America, especially from Mexico, and the fertility (生育) rates of these immigrants compared to black and white American natives. Americans like to boast of their past success in assimilating (同化) millions of immigrants into their society, culture, and politics. But Americans have tended to generalize about immigrants without distinguishing among them and have focused on the economic costs and benefits of immigration, ignoring its social and cultural consequences. As a result, they have overlooked the unique characteristics and problems posed by contemporary Hispanic immigration. The extent and nature of this immigration differ fundamentally from those of previous immigration, and the assimilation successes of the past are unlikely to be copied with the contemporary flood of immigrants from Latin America. This reality poses a f
A. The focus on the social and cultural costs and benefits of immigration.
B. The distinction they made between immigrants.
C. The lack of recognition of the immigrants’ economic influence.
D. The lack of recognition of the immigrants’ differences.