What word describes the united states economy during the 2930s?

How did the beliefs of the roman catholics differ from the eastern orthodox form of christianity?

What does it mean in the declaration of independence for cutting off our trade with all parts of the world

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.