Sadly, at one time in history or another, genocide has occured in nearly every nation of the world.
A big issue worldwide on genocide is located in darfur.
Holocaust
Allegations of a "Tibet genocide" has never been proven, nor is it recognized by any country in the world.
Democracy is thought to have first been practiced in ancient Athens, in Greece This would have been during the 6th century BCE, although there are claims that civilizations in Egypt may have practiced it prior.
Third World Genocide was created in 2003-08.
You have to be more specific about which genocide you are referring to, as there has been dozens of genocide over the years.
The nazis killed their own citizens and those in surrounding countries - specifically those of the Jewish religion, gypsies, etc.
Armenian Genocide is commemorated on 24 April every year. It took place in 1915, however earlier deportation to death and massacres were practiced in Ottoman empire from 1880's.
Yes Rowanda and Dafur
To kill all those of non-aryan decent. (Blond hair and Blue eyes.)
Typically, a genocide is "certified" by leading academics when a set of circumstances in the world qualifies under the definition of genocide.
There have been many genocides all over the world, so you have to be more specific.
The genocide convention