Donald Trump won the presidency by pledging to restore a vanished and golden economic era, when growth roared, factory jobs flourished and America sat unchallenged atop the global economy.
Yet he never offered much of a roadmap.
Which is why it's far from clear how Trump will affect the economy, even though his agenda enjoys the advantage of Republican control of both the House and Senate. Trump has pledged to revitalize the mainly white working class that elevated him — a tough task given an aging U.S. workforce, dwindling options for people with little education and years of stagnant pay.
Trump has said he'd slash taxes, strong-arm U.S. trading partners, end...