A citizen is a legal resident of the United States. Citizen responsibilities are obeying the law (such as: serving jury duty and paying taxes).
Only cash is capable of this.
(Debit cards normally have overdraft protection.)
Answer:
The Ghana Empire crumbled from the 12th century CE following drought, civil wars, the opening up of trade routes elsewhere, and the rise of the Sosso Kingdom (c. 1180-1235 CE) and then the Mali Empire (1240-1645 CE).