Final answer:
Dissociative identity disorder is diagnosed most frequently in the United States, where there is a higher overall prevalence of mental disorders and substantial scientific interest in dissociative disorders.
Step-by-step explanation:
The dissociative identity disorder is diagnosed most frequently in the United States. According to studies, the countries that have the highest rates of individuals ever diagnosed with dissociative disorders range significantly, but the United States tend to have a higher prevalence of mental disorders in general compared to other countries.
The most common mental disorders in the United States include anxiety disorders, with significant portions of the U.S. adult population likely to be affected within a single year or over the course of a lifetime, and other disorders like dissociative identity disorder are also not uncommon.
Research literature, such as Cardeña and Gleaves (2006), indicates that there is a considerable amount of interest and recognition of dissociative identity disorder within the United States.
Additionally, Pope et al. (2006) have suggested that dissociative amnesia and other dissociative conditions might be influenced by cultural factors, which could play a role in the diagnostic frequency within different regions, including the United States.
It's important to note that while dissociative identity disorder may be more frequently diagnosed in the United States, this does not necessarily mean it is more prevalent, as diagnostic practices and awareness of the disorder can vary widely between countries.