What should a historian remember about using secondary sources? A. It is important to confirm that the writer is not omitting
contradictory information.
B. A secondary source can by definition offer only one perspective on
an event.
C. A secondary sources analysis of an event should always remain
objective.
D. A secondary source's biases are often cleverly hidden.

What amendment limits the government's power to take away individual liberties -first -second -ninth -all of the above

How did the phillips brothers expand their businesses? by selling it to other businessmen by changing their source product by merging their companies by acquiring government support

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.