Which of the following questions applies the strategy of comparing and contrasting?

a. why did the united states fall into an economic depression during the 1930s?
b. could the civil war have been avoided?
c. what was the major outcome of the 1892 presidential election?
d. how did george w. bush's administration differ from his father's?

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.

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?

The tuskegee institute offered training to african americans in business and finance industrial and agricultural skills medicine liberal arts