What were some big, maybe famous riots that happened in America any time from 1900-1980's or 90's?

I think i am going to do something about a riot for National History day instead of my original idea, The Battle of Marathon, since more recent riots would have more primary sources that I can get.
Update: Do you think doing the Cincinnati Riots is a good thing? Even though it was in 2001, I could still do it. I just need both secondary and primary sources..It happened 7 years ago so I supposed there are secondary sources.
I have to do a 10 page report btw, so I need sometrhing with enough material =]
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