Answer:
The 14th Amendment.
Explanation:
The thirteenthy amendment freed the slaves, the fourteenth amendment provinded citizenship to all people born in the United States, and the 15th amendment gave righting votes to all men.
I remember this by this handy acronym:
13-- Free
14-- Citizens
15-- Vote.
It can be a large waterfall or it can be a medical condition in which the lens of the eye becomes constantly opaque, which is a result of, blurred vision.
Hope this helped!