What was the significance and lasting impact of the junto, benjamin franklin’s discussion group?

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

And the spark struck out by that steed, in his flight, kindled the land into flame with its heat.what do you think he meant

Supreme court cases can alter history? true or false