What started WWII? What ended It?

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.

Who coined the phrase “go west and grow with the country”?

What are some ways in which the british monarchy reacted to colonists continuing to disobey british laws?