The correct option is C Slavery
The African-Americans are the descendants of the Africans who were brought into America as slaves between the 17th century and early 19th century. Even though slavery was abolished in 1865, they faced discrimination in the country. The school system denied American children to mingle with African-American children; African-Americans were denied equitable housing rights and faced discrimination in employment opportunities. Several public places were segregated between White and Black Americans.