Which region was described as "the powder keg of Europe" prior to world War l

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 of the following describes the branches of government in china? a executive b state council c judicial d premier e legislative f npc g ministers of state

Why did the second indochina war start in 1956