Why did the u. s government want to remove native americans from western lands, and what strategies did they use to accomplish this ?

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 would employers want there to be large numbers of unemployed workers around?

Which was a major effect of the canal craze of the early 19th century