Campare first world war with the Second World War​

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.

What is one way that the congress of vienna changed the map of europe?

Brainliesttt asap!me : describe the responses to terrorism in the united states.