The economy of the united states is a
a. unitary system
b. confederate system
c. democratic system
d. free enterprise system

What is the supreme law of the land? the declaration of independence the federalist papers the articles of confederation the constitution

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.

Which piece of information would most a historian create an interpretation of this photograph of works in a factory?