@H2O MAN,
Gosh, lots of ways.
I expect he will be able to continue to help the economy recover.
There will likely be a couple of Supreme Court appointments made during his next term, and I expect him to select fair-minded scholars who won't erode liberties (Roe vs. Wade, etc.)
I expect that he won't rush into war, nor engage in macho sabre-rattling that would make war more likely. While also continuing to draw down/ end the war in Afghanistan.
There will likely be more movement towards alternative energies and innovation in general.
There may be some actual progress made re: climate change.
The ACA is now the law of the land, and a lot of its most important provisions will be kicking in soon.
Etc., etc., etc.