How much does it cost to outfit a u. s soldier

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.

Neutrality is no longer feasible or desirable where the peace of the world is involved and the freedom of its peoples. —war message to congress, woodrow wilson how does wilson use the meaning of the word freedom to justify war?

What significance does alfred t. mahan have on expansion and imperial policies of the late 1800s?