Feelings of resentment toward those who were not native citizens rose during World War I. This was known as

Nativism is prejudice or resentment directed toward immigrants and people seen as foreign or not native-born citizens. During World War I, suspicion of people considered outsiders increased, so the term is nativism. Nationalism is strong loyalty to one’s nation, while naturalism and nation-building do not describe this resentment.

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