How did u. s. participation in world war i promote nativist feelings in
the country?

With the outbreak of war in Europe in August 1914, the geographical and political isolation— that placed foreign policy above controversy, rendered immigrant attitudes nonpolitical, facilitated assimilation, and shielded the melting pot—quickly dissipated. Foreigners who earlier solicited American support—like Edmond Genet and Lajos Kossuth—annoyed nativists, but did not change American noninterventionism. Even the wars with Mexico and Spain underlined unity. But now Europe seemed much closer. President Wilson's assurance that the United States would not intervene notwithstanding, nativism as a force for patriotism and national unity stressed conformity—targeting German Americans and political radicals. Divisive themes, like anti-Catholicism and Teutonic racism, disappeared from the nativist lexicon.

Nativism in World War I had much in common with xenophobia during the Quasi-War. The chief assertion of American nationalism, termed "100 percent Americanism" after U.S. intervention, attested to the realization of cultural and social diversity amidst crisis. First-and second-generation immigrants comprised one-third of America's population—a point made more problematic by the loss of confidence by Progressive reformers. Hence, the preparedness campaign during the period of neutrality (1914–1917) focused primarily on German immigrants. Well-organized, prosperous, and self-consciously retaining old-world customs, German Americans mobilized following the outbreak of war to block munitions shipments to belligerents and counter sensational "Hun" propaganda stories emanating from London. In January 1915 the German-American Alliance met in New York, demonstrating a great show of unity—and outraging American nativists.

Read more: https://www.americanforeignrelations.com/E-N/Nativism-World-war-i-and-the-1920s.html#ixzz67GUTyAnP

Explanation:

the two things that develop a strong social foundation are: a. separation of church and states e. education received attention separation of church and states separate the illogical  argument that came from religious beliefs to a fact based belief. while education will make us remember the past to avoid the repeat of our mistakes.