I see a colored padlock on Delbert's profile and I see that you are the Profile Manager. You are, therefore, the only one who can correct that location. So far as I know, you need only remove the words United States of America
Other than that action on your part, the list of suggested locations that pop up are in the command of www.familysearch.org
While there have been comments about how accurate the suggested locations are, there's is nothing WikiTree can do to change them.
You can choose not to use the suggestions about locations.