Isma’il conquered what is modern day iran. what is he known for doing? using gunpowder to build his army. building schools and promoting music and poetry. building the taj mahal for his wife. putting those to death who didn’t covert to shi’ism

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.