So, is there any evidence Trump is putting "America" first?
America is a country, it's not a human being. Which part of the country is he putting first? The land? The trees?
As for "Americans", as far as I can tell he's only putting one American first, and that's himself.
He wants to fire Powell from the Federal Reserve, so he can lower the value of the dollar and increase inflation.
Who does that benefit? Not a single person who doesn't own a business, that's a start, and that's a lot of people. Some business people will do well because their products will cost less because their workers are cheaper.
That doesn't sound like "Americans"... but "the rich Americans". Even then some will lose out.