The argument that immigrants depress wages, displace workers, boost crime and disease, and pose a threat to the national security of the U.S. runs counter to political ideals of free trade and the views of conservative hero President Ronald Reagan, who supported amnesty for illegal immigrants and open borders, according to Riley, a conservative columnist. He briefly examines the long and sordid history of opposition to immigrants from Germany, Ireland, China, and, more recently, Latin America. Riley notes that immigration opponents are joined in their resistance to open borders by some environmentalists concerned about the impact on the earth of a burgeoning U.S. population. He challenges the notion that the current targets of immigrant ire—Hispanics—are somehow different from immigrants of the past. Riley also explores the compatibility between open immigration and free-market conservatism and homeland security. Because immigrants strengthen the economy through their labor and entrepreneurism, our policy on immigration should recognize economic realities and focus on providing legal ways for immigrants to enter the country through guest-worker programs, according to Riley. An illuminating look at immigration. --Vanessa Bush

Jason L. Riley is a member of the editorial board at The Wall Street Journal, where he has worked since 1994. He appears regularly on The Journal Editorial Report on Fox News. HeÂs also appeared on The NewsHour with Jim Lehrer, Hannity & Colmes, and ABCÂs World News Tonight.