which describes how the u. s. government changed from the articles of confederation to the u. s. constitution?

How did political revolutions in the atlantic ocean basin affect or alter the institution of slavery and the lives of slaves

What tactic did palestinians use against israel in 1987

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.