Post-1945 immigration to the United States differed fairly dramatically from America’s earlier 20th- and 19th-century immigration patterns, most notably in the dramatic rise in numbers of immigrants from Asia. Beginning in the late 19th century, the U.S. government took steps to bar immigration from Asia. The establishment of the national origins quota system in the 1924 Immigration Act narrowed the entryway for eastern and central Europeans, making western Europe the dominant source of immigrants. These policies shaped the racial and ethnic profile of the American population before 1945. Signs of change began to occur during and after World War II. The recruitment of temporary agricultural workers from Mexico led to an influx of Mexicans, and the repeal of Asian exclusion laws opened the door for Asian immigrants. Responding to complex international politics during the Cold War, the United States also formulated a series of refugee policies, admitting refugees from Europe, the western hemisphere, and later Southeast Asia. The movement of people to the United States increased drastically after 1965, when immigration reform ended the national origins quota system. The intricate and intriguing history of U.S. immigration after 1945 thus demonstrates how the United States related to a fast-changing world, its less restrictive immigration policies increasing the fluidity of the American population, with a substantial impact on American identity and domestic policy.
Relations between the United States and Mexico have rarely been easy. Ever since the United States invaded its southern neighbor and seized half of its national territory in the 19th century, the two countries have struggled to establish a relationship based on mutual trust and respect. Over the two centuries since Mexico’s independence, the governments and citizens of both countries have played central roles in shaping each other’s political, economic, social, and cultural development. Although this process has involved—even required—a great deal of cooperation, relations between the United States and Mexico have more often been characterized by antagonism, exploitation, and unilateralism. This long history of tensions has contributed to the three greatest challenges that these countries face together today: economic development, immigration, and drug-related violence.