The correct answer is B. Force one person to work for another person
Explanation:
The Thirteenth Amendment created in 1864 and ratified by the different states in 1865 established the abolition of slavery and involuntary servitude in all the cases except when it was used as a punishment for crime. This amendment aimed at formally abolishing slavery in all the states of U.S.; hoverer, other issues such as supremacists violence and Black Codes that restricted African American rights and freedom continued. Thus, according to tho the Thirteenth Amendment forcing one person to work for another person was illegal considering the person did not agree or accepted the work voluntarily which was part of slavery and involuntary servitude, in which people are forced to work without remuneration and against his will.
because they are isolating themselves from the rest of the world. they wanted to focus on protecting themselves from the north so a takeover from the Mongols would never happen again. thus they stopped making ships and cut themselves off from everyone else.