Explain how President Truman taking over changed the relationship between the former allies

How did the incas unite the andes mountains?

Why was the tea tax seen as a reprehensible to the people of boston ?

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.