What effect did FDR’s appointment of African Americans to key positions within the government have on party politics?

According to thomas hobbes concept of the social contract, what do people exchange for the protection by the government?

Why would the isolation of buddhist monks contribute to the religion’s decline?

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.