Wow, only about 50% vote, that is very low. I did read - quite a while back - that they have all kinds of ridiculous requirements to be able to vote, apparently to prevent black people from voting, if my understanding is correct. As for the Trump voters, your description is just about what i expected. I think this is the case in our european country as well; protest voters who vote for rightwing extremist parties.
Thank you so much for your elaborate reply and the links, which i will read, very much appreciated.