Which group of nativists specifically target as threats to "american culture"

The answer is Catholic and Jewish because the Nativists thought that these immigrants would ultimately ruin the american culture and way.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

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