Why did the ottoman empire join the war

What was a major cause of world war i?

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.

Why are both hamilton and jefferson writing to george washington? based on both of these letters, what seems to have been happening in george washington's administration? how can you tell?