Which of the following did garrett morgan invent

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.

Would creole revolutionaries tend to be democratic or authoritarian leaders?

What did the united states agree to do in the treaty of guadalupe hidalgo? time4learning