That is not just limited just to Trump supporters.  The voters of both parties in the US are no longer taught such things.  

Our 'educators' have other subjects and tasks of greater importance.

" 36% of those surveyed could name all three branches of government; 35% couldn’t name a single one"
"21% think that a 5-4 Supreme Court decision is sent back to Congress to be reconsidered"


http://www.annenbergpublicpolicycenter.org/americans-know-surprisingly-little-about-their-government-survey-finds/


Those who actually vote often can't name even one of their two Senators.  77% of millennials can't do it.  

"Meanwhile, certain demographic groups within the survey earned a particularly low grade. Just 18 percent of 18- to 24-year-olds, 16 percent of Latinos, and 10 percent of African-Americans could correctly identify one of their senators."

https://townhall.com/tipsheet/christinerousselle/2015/02/03/poll-shows-majority-of-millennials-cant-name-own-senator-n1952300