Question

what political concern heightened anti - immigrant sentiments in the wake of world war i? the pro - monarchist influence of new british allies protectionist opposition to international trade the red scare and fears of communism

Explanation:

After World War I, the Red Scare led to fears that immigrants, especially those with radical - leaning ideologies, might bring communist ideas and cause social unrest. This fear heightened anti - immigrant sentiments. The other options are not directly related to anti - immigrant sentiments post - WWI.

Answer:

the Red Scare and fears of communism