Immigrant Groups and Nativism in Late 19th Century America

In the late 19th century, the United States saw a massive influx of immigrants, many of whom arrived in response to both push and pull factors. This era was marked by the establishment of ethnic enclaves and the emergence of significant nativist sentiments in certain segments of American society. Among the following groups of immigrants, which was the least likely to find acceptance and face the most significant opposition during this time period due to their cultural practices and perceived differences?