The United States is known as a nation of immigrants, but Erika Lee also reminds us that it is also a place where an irrational fear and hostility toward immigrants has been present from colonial times through the Trump era. In the past, the Germans, the Chinese, the Japanese, and Irish Catholics have been the unwanted immigrants, while today, Americans it is Muslims and Latinos. Forcing us to confront this history, Lee explains how xenophobia works, why it has endured, and how it threatens America.