Describe the commitment/main focus of the Truman Doctrin

Find and simplify an expression for the area of five rows of square with side lengths of x

Define the term brutalization effect and describe in your own words why you think this occurs and how it conflicts with the ideas of deterrence theory.

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.