The theory stated that the unconscious was the key to improving civilization is sigmund freud.
For Freud, the unconscious is made up of desires and drives, which when repressed can generate harmful effects on the subject's psychic health (neuroses). He developed analysis as a method of curing these neuroses.
Freud argues that the identification between mind and consciousness cannot be justified, in the first place, because it would consist in an "inadequate convention" : some philosophical and psychological doctrines would have conventionally established that the psychic is the conscious.
See more about Freud at brainly.com/question/10772547
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