DDURING THE LATE NINETEENTH and early twentieth centuries unprecedented numbers of people from Europe, Asia, and the Middle East settled across North and South America. The largest wave of immigrants — some 28 million between 1860 and 1914 — settled in the United States. Another 8 million had settled in Argentina and Brazil by 1930. This cycle of immigration was a product of liberal political and economic reforms that abolished slavery, established stable political systems, and created a framework for integrating immigrants as factory and farm laborers.