Why do you think the Ottoman Empire so successful? Explain?

Which statement describes a similarity between the great migration and to this day

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.

The source of wealth for the city-states of the east african coast was trade between the interior of africa and the far east. true false