Trumps slogan to "Make America Great Again", was based on a prosperous US which had most of the economic output after WWII. Jonny come lately wants things to be the good old BOOM days. Unfortunately protectionism and the realities of the world is that the US is not the best at everything, nor making everything. Making themselves hated and ridiculed across the world by electing Trump and supporting him is where this is going. Unfortunately I think that more terrorist (home grown most likely) will be the result of Trump policies.
You want to make America Great Again? Dump Trump!