Ideals can only be demonstrated.
To teach by example, is what it's called.
Ideals cannot be installed. That is called the Inquisition.
So the best way Americans can encourage democracy is to support democratic institutions, encourage equal opportunity in economic and social institutions, and to uphold, protect and practice civil liberties wherever we are.
When you figure out where warrantless searches, secret arrests, and prisoner abuse figure into this, let me know.