What did neolithic farmers invent to them cut grain

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.

Only 1 vote per state regardless of size why is this a problem

What country gained its independence from france shortly after the french revolution as a result of a slave rebellion