It appears that the present-day form of African American English is not the inheritance of the period of slavery, but the creation of the second half of the 20th century.
“The U.S. government knew that China wanted to acquire sensitive U.S. technology, and instead of implementing a policy to prevent them from acquiring the information, the government all but gave them an invitation to take our equipment and designs.”
“We had no more courage than Harriet Tubman or Marcus Garvey had in their times. We just had a more vulnerable enemy.”