Why were nativists opposed to many immigrant groups?

Nativists opposed many immigrant groups due to fears that immigrants would dilute American culture, values, and identity. They believed that newcomers threatened jobs and economic stability by accepting lower wages and competing for employment. Additionally, nativists often associated certain immigrant groups with crime, political radicalism, or different religious beliefs, which fueled prejudice and discrimination. This backlash reflected broader anxieties about changes in society and the economy during periods of significant Immigration.