Last I checked we're no longer droning people directly in Yemen Obama-style (although Saudis are, and we're helping them), we've defeated ISIS and are in the process of withdrawing from Syria, there's troop withdrawal (although still incomplete due to Taliban stirring shit in September) from Afghanistan. Importantly, we haven't started any new wars on Trump's watch. Obama started several. So did Bush. Clinton before him started one. So did Bush senior before Clinton.

That's as good a peace record as you'll find in a US president in the last 100 years.