Which example illustrates an oligopoly market structure in early american history?

An event leading to german surrender was: the victory of turkey and bulgaria the uniting of austria-hungary the united states joining the allies the allies retreating from the germans

List five major cold war events that occurred internationally between 1945 and 1965. list five domestic events that occurred in the united states during the same period. make sure to include a brief description and the year of each event.

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.