The Community Health Act of 1963 was supposed to transfer mentally-ill patients from psychiatric hospitals to community-based centers, but "only half of the proposed centers were ever built; none were fully funded, and the act didn’t provide money to operate them long-term."
https://en.wikipedia.org/wiki/Community_Mental_Health_Act
During the 80s "HUD's budget authority was reduced from $74 billion to $19 billion. Such alleged changes is claimed to have resulted in an inadequate supply of affordable housing to meet the growing demand of low-income populations. In 1970 there were 300,000 more low-cost rental units (6.5 million) than low-income renter households (6.2 million). By 1985, the advocacy group claimed that the number of low-cost units had fallen to 5.6 million, and the number of low-income renter households had grown to 8.9 million, a disparity of 3.3 million units."
https://en.wikipedia.org/wiki/Homelessness_in_the_United_Sta...