Researchers who investigate how millennials' voting patterns change following the 2016 u. s. presidential election would be studying

history-graded influences

Explanation:

According to my research on various political studies, I can say that based on the information provided within the question these researchers would be studying history-graded influences. These are known as the experiences which influence life and are correlated with historical time while being experienced by the majority of a culture. Such as previous presidential elections and wars.

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answer; develops policy;

answer; legislative branch;