Advantages and disadvantages of parliamentary and presidential government

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.

What was a common theme of folk and rock music created by the 1960s counterculture? a.nonviolence b.hate c.self-denial d.aggression

Which situation would most likely be checked by other branches of the government? a) the judiciary tries to declare a state of emergency. b) the president tries to declare himself commander in chief. eliminate c) the supreme court tries to declare a law unconstitutional. d) the legislative branch tries to declare war on another country.