What were some of the disasters that occurred with the development of some of the new technologies?

What was president nixon’s approach of using tension between us and other nations

What russian alphabet was influenced by the greeks?

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.