To what international group do the initials OAS refer?

Historians are concerned with the accuracy of their writings and readings but are also aware of the inability of authors to know every angle of every story biases, perspectives, beliefs, and a variety of other differences history being told by one person at a time no one being totally accurate, as hard as we try really need on this, and you^^

Oque provoca coroço no peito do homen?

How did the voting rights act and the 15th amendment combine to improve individual rights for african americans