What was cuba’s relationship to the us in 1898-1903?

Was an extremist group that operated in the south. they attacked blacks in broad daylight. they mainly wanted to restore to power.

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?

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.