What was the golden age in indian culture

Why were inventors essential or necessary for an industrial revolution to happen in america

How do you think american life would change greatly, as soldiers went to war in europe?

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.