The widespread acceptance that bacteria causes diseases helped lead to a public health movement in the late nineteenth and early twentieth centuries. This movement eventually brought​ sewers, clean drinking​ water, and garbage removal to all U.S. cities. The public health movement in the United States in the late nineteenth and early twentieth centuries was like a technological advance to the​ country's production​ possibilities, since both ____________ expanded secured the​ economy's productive​ capacity, the former by increasing the​ nation's ________ degree of sophistication effective workforce .