I've always heard that Reagan eliminated mental health care in the USA

[former9thward]

23. Since I have often read this charge, I was waiting to read how Reagan did it.

Which was the second line of the OP. I did not read anything about that.

Reagan did not lead the "de institutional" movement, the ACLU did as they proudly relate on their website. Beginning in the mid-1970s the ACLU filed a series of lawsuits against mental health hospitals for involuntarily holding patients.

The ACLU's most important Supreme Court case involving the rights of people with mental illness was filed on behalf of Kenneth Donaldson, who had been involuntarily confined in a Florida State Hospital for 15 years. He was not dangerous and had received no medical treatment. In a landmark decision for mental health law in 1975, a unanimous Supreme Court ruled that states cannot confine a non-dangerous individual who can survive on his own, or with help from family and friends.


https://www.aclu.org/other/aclu-history-mental-institutions

Almost all mental health is dealt with (or not dealt with) by the states, not the Federal government.