How brain chemistry affects how we feel and act is a part of which perspective?

I believe the answer is: Biopsychology

Byopsychology studies the correlation between our physical condition to the behaviour that we displays in our interraction. The chemistry that released by our brain under certain situation would affect the emotion that we felt at that time, which would most likely influence how we behave in response to that emotion.

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.  

answer; ratification;