Actually, that "Make America Great Again" is quite clever.  It's open-ended enough so each individual can apply it as he/she prefers.  Trump appeals to "disgruntled" Americans.  He offers them a promise of a cure for all that ails America.  His is the political Snake Oil that will cure dandruff, fallen arches and everything in between.  

"Make America Great Again" implies a reactionary agenda.  It implies that our nation is "going to Hell in a handbasket" and he's available to save it.  Mr. Trump is demanding a vote of "confidence"...actually, a vote of "faith" that he and his Trump's Magic Elixir  are America's panacea.  

Pardon my skepticism, but I don't believe in "cure-alls": medical, social or political.  In fact, they're often worse than the malady they were adverised to cure.  I would suggest Mr. Trump's remedies would be just that.