En qué año se fundó El Salvador

What were the main features of the aristotelian-ptolemaic model of the cosmos

Pl hell mafter the civil war which president was called a "carpetbagger"? a. lincolnb. johnsonb. grant

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.