Questions: prejudice against other races. worries about overpopulation. high US unemployment levels. differences in culture and language.

The question appears to be related to the reasons behind opposition to new immigration in the United States. Let's analyze the potential reasons listed:

1. Prejudice against other races: This is a significant factor in opposition to new immigration. Throughout history, racial prejudice has often fueled resistance to immigrants from different racial and ethnic backgrounds. For example, the Chinese Exclusion Act of 1882 was a direct result of racial prejudice against Chinese immigrants.

2. Worries about overpopulation: Concerns about overpopulation have also been a reason for opposition to immigration. People may fear that an influx of immigrants will strain resources, such as housing, healthcare, and education systems. This was a common argument during the early 20th century when the US experienced a large wave of immigrants from Europe.

3. High US unemployment levels: Economic concerns, particularly high unemployment levels, can lead to opposition to immigration. The belief is that immigrants might take jobs away from native-born citizens or drive down wages. This was a prevalent concern during the Great Depression in the 1930s.

4. Differences in culture and language: Cultural and linguistic differences can also be a source of opposition to immigration. Some people may feel that immigrants will not assimilate into the dominant culture or that they will change the cultural landscape of the country. This was a common sentiment during the late 19th and early 20th centuries when many immigrants from Southern and Eastern Europe arrived in the US.

In summary, the reasons for opposition to new immigration can be multifaceted, including racial prejudice, concerns about overpopulation, economic worries, and cultural differences. Each of these factors has played a role at different times in US history.