Answer:
New Immigrants
Step-by-step explanation:
By the end of the 19th century, jingoism in the United States was encouraged by all of the following except "NEW IMMIGRANTS"
This is evident in the fact that Jingoism is a term that describes a drastic form of loyalty, nationalism, or allegiance, especially in the form of assertive or warlike foreign policy.
Hence, from the available options, the "New Immigrants" that are the foreigners settling into the United States did not encourage Jingoism.