> how has Donald Trump served the interests of "working people without a college education" during the four years of his presidency?

Uneducated working class folks compete with illegal immigrants for jobs and cheap housing. During his presidency illegal immigration was lower and wages rose for the working class and housing costs were relatively stable. He’s also positioned himself as the “law and order” candidate, and crime tends to impact the working class much more than the middle/upper classes.

Mostly folks who voted for him voted on the premise that their experience of the economy was better when he was president rather than on the basis of individual policies.