What is the main purpose of 'What to the Slave Is the Fourth of July' ?
A.to celebrate with the Northern audience the national holiday, which belongs to all citizens, not just white people
B.to remind the Northern audience of their forefathers' patriotic act
C. to warn the Northern audience of the possibility ofhistory repeating itself persuade the Northern audience
D.To insist on the abolition of slavery across the nation, not just to stop slavery from spreading