It is not to be confused that if you co-parent, both parents are playing a role of supporting and raising the child. Recent years have seen the increasing incidence and visibility of uncoupled women who choose to be single parents.
When single women seek to get pregnant intentionally in order to become single mothers by choice (or "choice moms"), they often seek an anonymous or known sperm donor.
Divorce was generally rare historically (although this depends by culture and era), and divorce especially became very difficult to obtain after the fall of the Roman Empire, in Medieval Europe, due to strong involvement of ecclesiastical courts in family life (though annulment and other forms of separation were more common).
In the United States, since the 1960s, there has been a marked increase in the number of children living with a single parent.
The 1980 United States Census reported that 19.5% were single parent households.