How can congress initiate the formal constitutional amendment process?

How did tyrants attempt to gain the approval of common citizens?

Describe hiw the meanings of the constitutional clauses that grant powers to congress have been defined

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.