True or false the Declaration of Independence made many people reconsider slavery

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.

True or false president andrew johnson granted pardons to thousands of southerners.

Compare the lives of slaves in mines and farms versus those in households