What first brought the republican party into power

How did the constitution of 1917 try to resolve some of the problems that started the mexican revolution

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.

In an industry in which there are several providers of a type of good, why can one business not charge much higher prices for their goods?