Why does it seem like the US in retreat?

I don't usually buy into conservative memes when it comes to the current President.  They're overly simplistic, fail to take into account real world realities and many seemed tinged with more than a bit of racism (yeah, I've seen some downright obscene photoshops...stuff that would make a Klansman blush).

Having said all that, it does seem like we're in retreat worldwide.  Now we're evacuating Yemen?  At the hour of their greatest need we withdraw?

The optics on this are terrible.

We're fickle partners at best and at worst we'll leave you high and dry after you put it all on the line for us (and Yemen did that).