Pat Buchanan says illegal immigration from poor and developing countries will overwhelm the United States and other Western countries in the next 50 years unless something is done. "We've already won the battle with the public," Mr. Buchanan tells The Washington Times. "The question is, when will the government respond?" In his new book "State of Emergency: The Third World Invasion and Conquest of America," the former presidential candidate and White House speechwriter examines immigration-related social problems and documents high levels of support among Hispanics for the so-called "Reconquista" of the U.S. Southwest. Several authors have addressed the immigration issue...