Exampleso f failed free enterprise economies?

Are there any free enterprise economies that haven';t been successful?

Cause I'm reading that part of America's success is due to its free enterprise economy and its dedication to it.

Which is fine on the surface, but simply committing to free enterprise isn't enough to actually make your country successful, is it? DDon't you also need a large workforce, a steady flow of credit, and a middle class/other markets to export to?

Roman empire
Though the Rome did collapse for a variety of reasons, self-driven economic failure was not one of them.