A general process in which the presentation of a stimulus leads to an increased response to a later stimulus is termed:

Sensitization

Explanation:

Sensitization: In psychology, the term "sensitization" is determined as one of the "non-associative" learning processes through which a stimulus gets the repeated or continuous exposure that often results into the "progressive amplification" or increase in strength of the reaction to a specific stimulus. Thus, the organism becomes more sensitive to that particular stimulus as time goes by.

In the question above, the given statement signifies sensitization.

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.