Which of these actions by the han dynasty reflects the meritocracy system

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.

How does fortas defend the majority decision that free speech in school is constitutionally protected

This map is depicting the 16th century route of what explorer