Which amendment after the Bill of Rights (Amendments 11-27) do you consider to be the most significant and why (be thorough)?

I need suggestions because I do not know which one i should pick. I say amendment 15 but I do not know why..help

2 answers

What did the 15th amendment do?

http://en.wikipedia.org/wiki/Fifteenth_Amendment_to_the_United_States_Constitution
ok I guess I am going with the 14th