Napoleons first defeat in his attempt to take over Europe was

What directive in source a might have been at the root of the action described in source b?

6. how did trade with the venetians contribute to the fall 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.