How did geography affect Indus River Valley civilizations? Constant monsoons led to destructive flooding. Mountainous terrain resulted in many invasions. Landmass formations encouraged trade with neighboring civilizations. Flooding separated many settlements from rivers and the Arabian Sea.

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.