Final answer:
Popular ideas centered around xenophobia include nativism, fear of competition from foreign workers, concerns about race integration, and concerns about empire building. Historical examples include the late republic of Rome, anti-German xenophobia during World War I, and hostility towards Asian immigrants in the early 20th century United States.
Step-by-step explanation:
The popular ideas centered around xenophobia include nativism, fear of competition from foreign workers, concerns about the integration of other races, and concerns that empire building ran counter to American democratic principles.
Examples of xenophobia in history include the late republic of Rome, where accusations about people not really coming properly from Rome were part of political invective and abuse, and the anti-German xenophobia in the United States during World War I, where German Americans were persecuted and their businesses shunned.
Hostility towards immigrants, especially from Asia, was prominent during the early 20th century in the United States, leading to restrictive immigration legislation.