Answer:
Black is the color of slavery in United States of America.
Step-by-step explanation:
Uncle Tom's Cabin portrays Blacks as having a racial caste system because this novel portrays the time when the black people were slaves. These black peoples were brought from Africa in order to do labor work. Before black people, only white people lives in the united states. So black color is the symbol of slavery and they had a separate caste in the american society before civil war. In this novel, the white master beat Tom because he is a slave and he did not tell the hiding place of runaways slaves to his master and died due to torture. This is the example of Blacks having a racial caste system.