There is a map, from 1792, is a plan for the city of washington d. c. how is it related to philadelphia?
both cities were planned by charles l'enfant.
both cities were built at the intersection of major rivers.
both cities were constructed in the late 1700s.
both cities were planned using the grid system.

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.