Trump changed many things.
U.S. media outlets will now point out when a president is lying. If that policy holds consistently, we’ll never have a war again.
Congress will now vote to end a war (Yemen) and a president will veto it. If Congress can repeat that on a monthly basis, and the president not veto, we’ll end a lot of wars.
Top military officials will openly laugh about tricking a president into believing he’d withdrawn more troops than he really had from a war (Syria). If presidents or Congress or the public should develop any outrage over that, we might be in good shape. If not, we could be in trouble.
The world can no longer as easily deny the selfish, destructive motivations behind U.S. imperialistic behavior, even if a new president dresses it up more politely.