How the issue of human rights evolved over the past 60 years and what
has the United Nations done to address this isssue?

You're asking two huge questions here, but offering a very small fee.
If you want answers to both of these questions, I suggest that you
greatly increase your price.

Start here:

50th Anniversary of the "Universal Declaration of Human Rights" 
http://www.unhchr.ch/html/50th/50anniv.htm

Wow, Sex is less than twice as popular as Human Rights  (238 million
to 141 million hits)!
This site could be a start:
http://www.hrweb.org/
I don't expect that it will be critical, which is a serious
consideration:  how much killing war is justifiable to defend Human
Rights?
The UN Charter says that countries should not involve themselves in
each others' internal affairs, which is why in Hungary (1956) and
Czechoslavakia (1968) the fiction of "inviting" support from other
communist bloc countries occurred.
That restraint has diminished in the last decade or so, at least in my opinion.