In which decade of the twentieth century did the government begin to take a much larger role in the us economy?

Where did khomeini seize power in 1979?

Diarys letters and memoirs are good examples of what

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.