I don't think it's tariffs. Most economists agree once you take into account retaliatory tariffs they're bad for the economy. This doesn't mean we shouldn't do them, it might be worth it to take a gdp hit to preserve certain types of jobs. Plus the trade deficit didn't really move.

I doubt it's deregulation especially in the short-term. It takes a herculean amount of deregulation to move gdp, and most of the impact would happen over the long term. Like they say it takes a lot of Harbinger's triangles to fill an Okun gap.

Honestly I think the Trump economy is mostly due to Trump yelling at the Fed to keep their foot on the gas. We had un/underemployment and he pushed them to lean a little harder on the accelerator.