How did the expansion of voting rights change the nature of political campaigns?

If a person has a right that is started in the constitution that

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.

How did the protestant reformation and scientific revolution advance individualism and liberal reforms?