Me asap what was the cause of the monroe doctrine? a.)great britain expanded its fleet of ships on he great lakes b.)france decided to reclaim territory it had ceded in the louisiana purchase c.)spain and portugal wanted to regain latin american lands that they had lost d.)spain would not give up its claim to florida

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.