What role did osman play in the building and expansion of the ottoman empire?

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.

Which development best illustrates why world was 1 is classified as a foal war

Who was francis marion and how was he linked to the revolutionary war?