Identify the subject as too broad, adequate, or too narrow. ghost towns of the western united states

Adequate

Explanation:

If we were to write an essay, this would be considered an adequate subject to write about. The topic states what it wants to discuss very clearly. Moreover, it is broad enough to be able to include a lot of information, while also narrow enough to avoid touching on the subject too superficially. Moreover, it is specific, which means that readers will know what to expect from it very quickly.