Final answer:
The federal government became involved in the delivery of mental health services in 1946 through the National Mental Health Act. This act aimed to address the growing need for mental health services and research in the United States.
Step-by-step explanation:
The question is asking about the involvement of the federal government in the delivery of mental health services. This falls under the subject of Social Studies. In 1946, the federal government became involved in mental health services through the passage of the National Mental Health Act. This act aimed to address the growing need for mental health services and research in the United States. It established the National Institute of Mental Health and provided funding for mental health programs and facilities.