how was the columbian exchange different from the european renaissance & the scramble for africa?

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.

Question 1 which of the following can be defined as a " non-public" forum? a. the inside hall of a convention hall. b. a public street corner c. the steps of a court house d. a school classroom question 2 why is it beneficial for the government to allow freedom of speech? a. by allowing freedom of speech, the government can improve by hearing and accepting criticism from the people. b. by allowing freedom of speech.the government can punish actions by it's citizens. c. by allowing freedom fo speech, the government will provide a diverse culture. d. by allowing freedom of speech, the government allows itself to be overthrown to create a better government. question 3 which of the following is an example of sedition? a. a socialist encourages military soldiers to leave the military before they are legally allowed to. b. a communist presents ideas for a new government. c. a student organizes a flag burning protest. d. the new york times is restricted from printing a story about a defense trial.

Viktor is a russian university student. he wants to go to new york for a semester to study and improve his english. what should he do before he buys his plane ticket? a. buy a map of new york city b. pay for his program in new york c. apply for a us visa d. apply for a policy waiver