How the sumer met the three criteria of a civilization.

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.

The code name for the invasion of europe was called operation ° overlord ° juno °torch

What does it mean to say the united states has a federal system of government