How did Americans' views on immigration changed between 1840-1850 and 1910-1920? How had opposition to immigration changed for those same time periods?

During the periods of 1840-1850 and 1910-1920, the views of immigration were similar. There was a strong rise of nativism during both times, but for different reasons. From 1840-1850, native-born Americans were afraid of the immigrants coming in and "stealing" their already low-wage jobs. Since factory jobs were becoming very popular due to the industrial revolution, the skill level for those jobs went down which dramatically changed the chances of getting laid off. Also, because it was so easy to lose a job, immigrants were able to come and easily replace workers for less pay. However, from 1910-1920, the rise of nativism is due to WWI. Americans were forced into the war because they felt challenged by the Germans. When the United States read about the terrible effects of the war, they strongly opposed any person not native to America. Even after the end of WWI, lingering ill feelings towards Europeans caused major conflicts in the United States that caused prejudice towards immigrants in America. One significant event, known as the Red Scare, is evidence of how much Americans became biased to immigrants because of WWI.