The battlewhy was the saratoga a turning point in the 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.

The communists triumphed over forces because of a well-disciplined fighting force, a single - minded sense of zeal , and strong convictions.

What event did not contribute to the start of ww11