Research further into the reason why there has been a continued political struggle between Protestants and Catholics in Ireland and Northern Ireland, then discuss your findings below.

What does the term “escalation” refer to?

Did the west show signs of cultural decline in the 20th century?

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.