Africans in the american colonies contributed significantly to the economy. slave labor, which was widely used to grow made these crops profitable for landowners. despite the lack of opportunities, some africans also contributed to american culture. a notable example was who published a successful almanac. *fill the blanks*

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.