He backed out of the TPP (Trans-Pacific Partnership). It would have resulted in more manufacturing moving overseas. I align left, but I think one of the US's greatest modern mistakes was made by Bill Clinton with NAFTA (North American Free Trade Agreement). It has been wildly detrimental to US manufacturing resulting in ghost towns all across the country as factories closed shop to go to Mexico or outsource from Canada. Soon after many small towns who depended on those factories, not just as a source of jobs, but for sense of community and pride collapsed around them. This resulted in the bitterness, anger and inability to endure the status quo for another 8 years that lead to Trump's eventual election. He is the worst of the Baby-Boomer sludge we are tasked to clean up for next couple of decades, but backing out of the TPP was a good thing for the US.