Travolta european nations were the only ones who were involved with colonizing the uncivilized world

The genocides on both cambodia and are examples of a. a holocaust b. the holodomor c. ethnic cleansing d. religious cleansing

What battle in the civil war was known as the bloodiest war ?

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.