What is an example of separation of powers in action?

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.

Following world war 2, how did the world's leaders promote peace and reduce poverty?

The unalienable rights of life, liberty and the right to own property acknowledge the importance of the ? a. king. b. individual. c. military. d. community.