Opposed to or hostile toward foreign people, countries, goods, or influences; expressing or promoting xenophobia.
From anti- + foreign (from Old French forein, meaning 'outside'). The term became more common in the 19th-20th centuries as nations industrialized and international trade increased, prompting reactionary attitudes.
Antiforeign movements pop up whenever people feel economically threatened—it's a pattern so consistent that historians can almost predict when they'll emerge based on recession timing.
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