Please help me I need this for a exam quick

What do historians call the political,social,or cultural circumstances surrounding an event?

Brainliesttt !me : ) how did the world react to liberalization measures from the soviet union?

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.