What is the paradox as related to slavery in the United States?

Question 1 options:

Slaves predominantly returned to Africa

That slavery was still allowed in a free nation

That slavery was outlawed in only part of the United States

There was no slavery in the United States

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.

What does the fall of the bastille represent? ?

Morgan is dividing 2 by 18. what will keep repeating in the quotient?