Why was the declaration of independence written? to persuade loyalists to side with the american patriots to explain why the american colonies had the right to be free to caution britain against military action against the american colonies to persuade king george to intervene on behalf of the american colonists

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.