The Rio Branco law, also known as the Law of Free Birth, named after its champion, prime minister José Paranhos, Viscount of Rio Branco, was passed by the General Assembly of the Empire of Brazil on 28 September 1871. It was intended to grant freedom to all newborn children of slaves, and slaves of the state or crown. However, children of enslaved women in Brazil were obligated to serve their mother's owners until the age of 21, a condition that was often more or less that of slavery. The law did not define the exact legal status of enslaved women's wombs; this was negotiated by enslaved people afterwards, with women at the forefront.
Source:Wikipedia — Rio Branco Law →