In what year did adolf hitler come to power? a 1938 b 1930 c 1940 d 1933

Why did roosevelt support a “europe first” strategy even though it had been japan that had first attacked the united states?

What kind of relationship did the soviet union have with the united states in 1945

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.