Answer:
Accessible mass media and industrialization was key to boost the Progressive movement.
Step-by-step explanation:
The Progressives were modernization supporters. The arrive of industrialization to The United States encouraged them to believe the time for a new era had begun. They saw science and technology as tools to improve society. On the other hand, The lowering of mass media public prices allowed the citizens to get more aware of the corruption inside the goverment. It was also a root cause which boosted the Progressive movement.