" Loss in Vietnam radicalized a generation of veterans, pushing many into the ranks of white-supremacist groups. Ronald Reagan, as the standard bearer of an ascendant New Right, effectively tapped into this radicalization, which helped lift him to victory in his 1980 presidential campaign. Once he was in office, Reagan's re-escalation of the Cold War allowed him to contain the radicalization, preventing it from spilling over (too much) into domestic politics. Anti-communist campaigns in Central America—a region Reagan called "our southern frontier"—were especially helpful in focusing militancy outward. But Reagan's Central American wars (which comprised support for the Contras in Nicaragua and death squads in El Salvador, Guatemala, and Honduras) generated millions of refugees, many, perhaps most, of whom fled to the United States. As they came over the border, they inflamed the same constituencies that Reagan had mobilized to wage the wars that had turned them into refugees in the first place. "

― Greg Grandin , The End of the Myth: From the Frontier to the Border Wall in the Mind of America