I am auditing a Joomla website that uses the MightySites component to create multiple versions of the same site for different state/province areas. For example, the site structure looks something like: example.com/fl/
example.com/mn/
example.com/ny/
example.com/wa/ etc. Each of the state home pages are largely identical and much of the content within each state sub-folder is a copy of the original content on the main example.com site, with minor changes here and there. The client is a national organization and needs to keep this structure to allow each state to be able to edit and change their own content, though as far as I can see content doesn't actually vary much. What's best practice here in reducing duplicate content issues? We can't use hreflang as it is all within one country (although it does also provide two different language versions of content, for which I will use hreflang.) Should we just canonical everything back to the corresponding pages on the example.com site? Any thoughts or recommendations much appreciated.