Answer:
the abolition of slavery (13th) and the granting of equal citizenship (14th) and voting rights (15th) to former slaves, all within a period of five years
Explanation:
If you won't the whole thing i just gave you the answer here is the well explained answer: The first three of these postwar amendments accomplished the most radical and rapid social and political change in American history: the abolition of slavery (13th) and the granting of equal citizenship (14th) and voting rights (15th) to former slaves, all within a period of five years
