Question

A major cause of antagonism toward the "new immigrants" who came to the united states after 1880 was the belief that they

Answer 1

Americans were afraid that new immigrants would take their jobs during the 1880's. During the late 19th century, the US was constantly expanding by building more railroads, roads, etc. that relied on labor. Businesses often hired the cheapest labor they could since there was no minimum wage laws yet. Often times, immigrants would take a lower pay rate than American citizens. 
This fear spread like wildfire and caused an increased amount of nativism. Nativism is the belief that the wants/need of native born citizens should be a priority over those of immigrants. 

Answer 2

The correct answer is “competed with Americans for Jobs as unskilled laborers.”

A major cause of antagonism toward “new immigrants” that came to the United States after 1880 was the belief that they competed with Americans for Jobs as unskilled laborers.

White American people have never accepted immigration. The are many reasons for this. Nationalistic ideas, the rejection of mix their culture, and labor reasons. Americans have considered that less-skilled immigrants come to America to get jobs because they accept low salaries or less wage in doing a job. This was the case in 1880. Chinese, Irish, Italian migration took jobs that American people thought belonged to them. And this caused antagonism and serious differences among them.