What do asian people build to honor buddha? 1)stupas2)astrolabe

Why was russia drawn into a conflict with germany after ausria-hungary declared war on serbia ?

During wwi, literacy tests were used to control immigration, which marked a return of what type of ideology in some americans?

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.