What was the purpose of the Kansas-Nebraska Act?

A)
to admit California to the Union

B)
to admit Kansas and Nebraska into the Union

C)
to organize Kansas and Nebraska into territories

D)
to create new slave laws that would help slave owners capture runaway slaves

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.