Where did Stalin imprison civilians?

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

How did geography influence the development of the byzantine 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.