The fight of disenfranchised or marginalized groups to regain their civil rights is generally referred to as a “civil rights struggle.” The use of the term is instructive as it indicates that although rights of citizenship, “inalienable rights,” are granted, for many they have to be wrested from society.
The "Bonus Army" was the name given to a large group of World War I veterans who marched on Washington to demand that their "service certificates" be repaid to them in cash, since the Great Depression had left many without employment.
The correct option is slavery
The constitution of Texas made the institution of slavery legal. It prohibited slave owners from freeing their slaves until they obtained the consent of Congress. It also forbade congress from legislating against slavery such as by banning slave trade