How did geography affect the development of new york and philadelphia

Which of the following is not true of american cowboys?

How did testimony such as this from the triangle shirtwaist factory disaster affect the workplace?

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.