What did progressivism flower in the first two decades of th 20 century?

In other words what explains the growth and development of progressive reform efforts in the first part of the 1900?

What did progressivism flower in the first two decades of th 20 century?
A bunch of things:





1: Mass communications were born. Newspapers in particular. It let the spread of ideas accelerate.


2: Leaders. The right people were in the right places. Muckrakers like Turbell and Lewis. Politicans like LaFollette and TR Roosevelt.


3: General revulsion at the Gilded Age. Sure, some folks got rich, but not on their own. They did it on the backs of others. And the others got sick of it.
Reply:http://en.wikipedia.org/wiki/Progressivi...