Final answer:
Dayton's municipal electric system was outdated and operated by a local sawmill before the intervention of the Tennessee Valley Authority (TVA). The TVA's construction of hydroelectric dams and generation of hydroelectric power brought electricity and modernization to the region.
Step-by-step explanation:
Before the intervention of the Tennessee Valley Authority (TVA), Dayton's municipal electric system was outdated and operated by a local sawmill. The TVA was created as part of the New Deal to bring low-cost electrical power to economically distressed regions, and it constructed hydroelectric dams to control flooding and generate hydroelectric power. The TVA's intervention modernized Dayton's municipal electric system, bringing electricity to thousands of residents for the first time.