The rapid westward migration caused by the discovery of gold in California led directly to the start of the Civil War

increased economic opportunities for different groups like women and Asians

increased trade through the Panama Canal

control of the United States Senate by the slave states

Which did president carter refuse to do in his attempt to free american hostages taken by iran?

Why did reagan have the united stars invade grenada

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.