went to look up the history of its use and found this
What follows is a brief chronological history of the use of lead-based paint in the United States:
Use of white lead began in the Colonial times and ultimately peaked in 1922.
In 1951, Baltimore banned the use of lead pigment in interior paint in Baltimore housing – the first such restriction in the country.
In 1955, the industry, working with public health officials and organizations, adopted a voluntary national standard to prohibit, in effect, the use of lead pigments in interior residential paints.
Through the 1950s and 1960s, the use of exterior lead-based paint declined significantly, and ended by the early 1970s.
In 1971, the federal Lead Poisoning Prevention Act was passed.
In 1978, the federal government banned consumer uses of lead paint.
went to look up the history of its use and found this