In 1950, about 22 percent of American adults were single. That number has more than doubled, marking one of the most significant changes to American demographics in the past century. In 2016, 59.8 million households in the United States were maintained by single people—47.6 percent.2 Close to 40 percent of babies are now born to unmarried women.
Not necessarily unpartnered / single mothers i.e. de facto couples.
