Have the cleveland indians won a world series

Why are primary sources important when studying historical events

How did the united states obtained the purchase of floridia to extand its frontiers to the pacific ocean

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.