Whenever endos say "Read the DSM! It doesn't even mention trauma!" it always pisses me off because that's blatantly false. First of all, the introduction to the dissociative disorders section has a whole paragraph on the link between trauma and dissociative symptoms.
"Dissociative disorders are frequently found in the aftermath of a wide variety of psychologically traumatic experiences in children, adolescents, and adults. Throughout this chapter, 'traumatic experiences' refers to experiences that result in psychological sequelae, as opposed to the physical impact that can cause a traumatic brain injury. Therefore, in the DSM-5, the dissociative disorders are placed next to, but are not part of, the trauma- and stressor- related disorders, reflecting the close relationship between these diagnostic classes. Both acute stress disorder and posttraumatic stress disorder include dissociative symptoms, such as amnesia, flashbacks, numbing, and depersonalization/derealization."
Secondly, in the diagnostic criteria for DID, it states:
"B. Recurrent gaps in the recall of everyday events, important personal information, and/or traumatic events that are inconsistent with ordinary forgetting."
Lastly, in the Associated Features section, it even gives more specific examples of the trauma that could cause DID:
"Individuals with the disorder typically report multiple types of interpersonal maltreatment in childhood and adulthood. Other overwhelming early life events, such as multiple long, painful, early-life medical procedures, also may be reported."
And that's not even getting into the numerous examples in other diagnostic tools of questions pertaining to trauma or the fact that the DSM is a.) very America-centric and b.) limited due to not including diagnoses like C-PTSD and P-DID (unlike the ICD-11, which does).