This is because the graph indicates the sharp decline of the rural population, due to in large part to the increase in urbanization and the ever-growing industrialization of the United States throughout the decades.
As such we can analyze that, as the years go by the population trends to move to urban areas in place of rural ones.
Jenner found germs and invented vaccines. Pasteur found how to kill germs from food for a very long time. Lister invented early antiseptics along with Listerine brand mouthwash. Please mark Brainliest!!!
