Final answer:
The Italians were most likely discriminated against because they were Catholic.
Step-by-step explanation:
The immigrant group that was most likely discriminated against because they were Catholic was the Italians.
During the late 19th and early 20th centuries, an influx of Italian immigrants arrived in the United States. They faced widespread discrimination and prejudice from the predominantly Protestant population.
Italian Catholics faced discrimination in various aspects of life, including employment, housing, and education. They were often portrayed as criminals and members of organized crime.
Learn more about immigrant discrimination based on religion