The following reference ensures statistics of other countries worldwide, rather than just the United States.
Overall, according to the New York Times', how a single parent is defined is dependent on each individual country's culture.
There are statistical graphs and charts to support previously mentioned concerns and topics.
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.
There are even some that argue that a single parent family is not even really a family.
In American society, where living standard is very high, single moms and single dads are more likely to be poor, not only because they don't have help in the household, but also because they didn't have much money to begin with.
Single American mothers live in poverty 5 times more often than married parents.
(National Women's Law Center, Poverty & Income Among Women & Families, 2000-2013) The topic is less contentious in Western European countries where all families enjoy more robust state-sponsored social benefits.
Sometimes, one finds themselves in a single-parent family structure that has arisen due to death of the partner, intentional artificial insemination, or unplanned pregnancy.
Historically, the death of a partner was a major cause of single parenting.
Single parenting has become a norm in the United States and is a trend found in many other countries.