To perform an economic miracle and revive the US economy, Trump needs to:
(1) implement protectionist policies to re-industrialise America;This is, more or less, what he has promised or what will be the consequences of what he has promised, even if Trump himself does not understand Keynesian economics.
(2) increase government spending on a massive infrastructure program and cut taxes (preferably for the working and middle class) in order to run huge Keynesian deficits, and
(3) radically reduce legal and illegal immigration, and indeed – as hostile as the Left is to this – start to deport illegal immigrants, so that US workers can enjoy labour market protectionism and a return to rising wages.
So can he do it? He will need to throw aside the deficit hysteria and smash the Republican Congressional opposition. In essence, Trump needs to tell the Republican libertarians and fiscal hawks in Congress to shut the hell up and support huge deficits. If he is smart, and given the mandate he has, he might just be able to do it too.