Final answer:
Labor unions historically opposed immigration as immigrants were often willing to work for low wages, leading to a shift in the unskilled labor market that negatively impacted low-skilled domestic workers. Cultural factors also made Americans, both native-born and immigrants, skeptical of joining unions due to their strong belief in economic individualism and American Exceptionalism.
Step-by-step explanation:
Many labor unions opposed immigration due to several concerns, one of them being that immigrants would work for low wages. This fear was rooted in historical patterns and contemporary observations. During the 1920s, immigration was viewed as a way to flood the labor market, with immigrants often willing to work in substandard conditions due to their dire circumstances. This willingness to accept lower wages made it difficult for unions to standardize wages and working conditions.