Describe the historical impact of the event to the field.How did the term/diagnosis of autism spectrum disorder originate?

Describe the historical impact of the event to the field. Consider the following:
How did the term/diagnosis of autism spectrum disorder originate?
Why was this event impactful during this time?
What were the perceptions of ASD during this time?
How has this event changed perceptions today?
Connect the event to a theory of ASD. Consider the following:
How is this event directly related to this theory?
How is the theory applied to the field today?