Neither did Trump.
Have we gotten into any optional wars since 2016?
No, but we might be a involved in Venezuela, Yemen, and other places where we have troops. With John Bolton in there, there does seem to be less communicating and more sanctioning. I really thought Trump was going to declare an official end to the NK war and turn over that DMZ to SK, and let them overwhelm the North with a consumer economy. And we're still in Afghanistan. And I've never regarded Syria or Assad as an enemy.
Syria, Yemen, Niger, etc? We’ve lost soldiers in all of those shitholes.