Certainly we are engaged in nation building under this administration. That came with acceptance of both the invasion of Afghanistan and Iraq. Truth be told we haven't done a very good job with Afghanistan and Iraq...well, it is even close to resembling an actual nation enough so that it can be rated.
You can't accept the invasion without the nation building. They came as a set, otherwise it is like playing a quarter of football then calling it quits. If people didn't accept that then it was the administration's fault for not making it clear to the public.
"You can't accept the invasion without the nation building."
I could , why not just destroy the enemy next time ?
We were not on the ground in Serbia holding territory or rebuilding the infrastructure.
If we are destroying an enemy do we owe them anything?
If we are to fight both Syria and Iraq in the next few years we will likely get a stab in the butt from North Korea and perhaps others while we are busy.
We are going to be pretty busy with a war like that and there will be little holding back and no planning for the cleanup.
I do not think that FDR or Trueman had the cleaning up and rebuilding stage in their minds as they firebombed and pushed the Manhatten project to completion, we won unequivocally and then started to plan for the peace.
What is the point of planning for a peace that you never do produce?