The german monk credited with starring the protestant reformation is

What arguments might a conservation used to justify president roosevelt's expansion of power of federal government

What do the discoveries of shells used in jewelry and a huge dredged canal tell us about the indus valley civilization?

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.