In the reconstruction period, free blacks donated more than $1 million to educate their friends and neighbors. True or false

Which one of the following statements best characterizes change to agriculture in the united states since 1900

What are the contributions of the byzantine empire

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.