What was an effect of the events in "bleeding kansas"?

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.

Morgan is dividing 2 by 18. what will keep repeating in the quotient?

How diamonds came to be the gem of choice for engagement ring