The whole Trump-Russia thing, there is probably more to it then what has been discovered or in mainstream news.
Trump is all about ego... so why not release his taxes, unless he has something to hide. If he is a billionaire then the tax documents would prove it. But the thing is that the tax documents will reveal who he does business with. Alot of speculation that Trump business has taken him into contact with Russian Mobsters/Russian Government.
If you are running for the President of the USA, business ties or not, you need to distance yourself from the unofficial enemy of the USA (Cold war- communism vs capitalism). Getting dirt on Hilliary through the Russians, whether true or not, its how they got the information that speaks volumes, leaving yourself open to blackmail because of where the information came from.
As for making America Great again, unless he goes on a world conquering spree, America will economically fade, due to cheaper labour from India and China. Robotics could help, but what do the people do? Also America is a country that has big problems with pollution (toxic waste dumps) and garbage waste, there are vast areas where the land is unfit for human habitation. Add in the floods, hurricanes and tornadoes in the last 10 years and ask can American afford to keep replacing buildings and infrastructure due to storms with such frequent happenings. Major Corporations will start to abandon the US when it becomes a toxic wasteland...
Tech is keeping America afloat, but the gap is closing between India, China, and Russia....
As for military might, you can have the best plane, ship, tank out there, but if you don't have enough of them, you loose to attrition... Look at Germany in WW2, they had some of the best equipment in tanks and ships, but the allies out produced them in tanks, ships and planes. Not to metioned they cut off their fuel resources in southern Russia and Romania.
Today America is fracking to produce more oil (which lowered world prices 4/5 years ago), they are bleeding themselves dry.
Also most retail stores will close due to the mail order business of Amazon, wayfair etc. No wonder those specialty shops cost so much..... Big box stores like Walmart get most of their inventory from overseas at cheaper labour costs and still make a big profit from it. Big corporation will get richer and the middle class will fade more into poverty.....