Final answer:
The phenomenon being described is the feminization of poverty, which refers to the increase of women as the majority among the poor. It highlights the economic inequality faced by single mothers and their families.
Step-by-step explanation:
The phenomenon being described in the question is called the feminization of poverty. This term refers to the increase in the number and percentage of women among the nation's poor. It is usually associated with the rising number of female-headed households and the increased tendency for these single mothers and their children to fall below the poverty line. This phenomenon highlights the inequality faced by single mothers and their families, particularly in terms of economic resources and opportunities. Single-parent families, especially those headed by women, are much more likely to be poor due to various factors including lower-paying jobs, lack of access to education and healthcare, and limited opportunities for economic advancement.