How did the battles of Gettysburg, and Atlanta/The March to the Sea prove pivotal to the Union's victory in the Civil War

Why did countries not allow jewish refugees asylum?

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.

The original term of was descriptive of lower-class people who performed manual labor.