Jason Riley, a Wall Street Journal columnist and senior fellow at the Manhattan Institute, makes the conservative case for immigration, arguing that newcomers strengthen rather than threaten American prosperity and values. Riley, the son of immigrants from the West Indies, challenges anti-immigration arguments from within the political right, contending that free-market conservatives should welcome labor mobility. The book systematically addresses common complaints: that immigrants take jobs from native workers, depress wages, abuse welfare programs, commit crimes at higher rates, and refuse to assimilate. Riley marshals economic research showing that immigration increases overall wealth, that immigrants commit crimes at lower rates than native-born citizens, and that today's immigrants are assimilating at rates comparable to previous waves. He criticizes restrictionists on the right for abandoning conservative principles when it comes to labor markets and family values. The book also examines how immigration policy has become a wedge issue, with Republicans increasingly hostile to immigrants despite the party's historical support for open borders and immigrant enterprise. Riley writes accessibly about economic concepts, making his case to general readers rather than specialists. The book provides ammunition for those who seek to reclaim a pro-immigration position as consistent with rather than contrary to conservative principles.