What are the three conditions of the Sussex Pledge regarding U-Boat attacks?

The area directly outside a city is called 1 rural 2 urban 3 suburban

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.

Due to their desire for a theocracy, what was at the center of new england life