Answer: Rise in aging population
Explanation:
America's aging population has been and continues to be on the rise as life expectancy rates increase. The elders who are aging amongst us however, require health care due to the loss of physical ability that comes with being old.
This is one of the main reasons why the number of healthcare professionals are on the rise and with nursing assistants, this is even more so. The aging need the help of these nursing assistants and so more old people means more nursing assistants.