The US is the leading directment of the idea that..

Yuk bloody yuk!

What's wrong with, say, "proponent"?
Or "propellent", at that.

A word that swims toward the future like a wiggle-tail male sperm cell hoping against hope to be fruitful and multiply until maybe one distant day the word "directment" will be the every other word out of everyone's mouth. Unfortunately, although many start out, few reach the egg.

Very good, Mr M.