 Complete the following phrase:  Sociologists have studied immigration closely in the twenty-first century. In the United States, compared to the majority of European immigrants during the early twentieth century, the twenty-first century witnessed the arrival of immigrants predominately from Asia, the Middle East, and Latin America. From 2000 to 2001, sociologists have paid particular attention to the costs and benefits of the new diversified immigration population on American institutions, culture, economic functions, and national security. After the 