Probably nothing much really.
The military won't follow orders to use torture. Apart from the fact that many of them have moral and legal objections, they cannot let themselves open to the inevitable lawsuits once a different administration is in power.
The wall will never be built. For one thing they would probably need immigrant labor to build it.
The muslim thing will slip completely except as rhetoric.
Trump will constantly promise all sorts of change and then be shocked that the constitution doesn't allow him/the US to do it.
Black people will continue to feel unwelcome and unprotected. The white non college educated men who voted for Trump will continue to be poor with poor prospects.
Obamacare will remain in place because the health care industry and insurance industry will make it quite clear that will not/cannot dismantle it.
There will be a huge increase in the number of communication specialists in the white house. One set to monitor what Trump says. The other to provide clarification when he breaks free (I am trying to imagine the scene in his camp after Michelle Obama's speech - I suspect they took his phone away from him to stop him saying something awful).
The gridlock in Washington about legislation will continue.
US will be a bit embarrassed about the crap he comes out with.
The entire nation will pray for the health of Ruth Badar Ginsberg. In fact most churches will start praying explictly for the health of all supreme court justices.
Then they will start praying for the health of Trump, when they get a good look at the actual beliefs of his VP.
Trump will give a cabinet position to his daughter and won't understand the uproar.
In 4 years time it will all be over.