Why did free african americans need certificates of freedom?

They could be legally killed or sold.

Explanation:

Free African-Americans required a certificate to verify their freedom because there were many people willing to sell them. Seeing an African American walking around town wasn't common unless they were collecting water or running errand for their owners. So, naturally people grew suspicious.

Also, many runaway slaves could say that they were free. And, there would be no way to verify that if there were no certificates .

Slavery was truly a terrible time.

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

the correct answer to your question is c the factory goes out of business, causing the workers to lose their jobs.

explanation: