Writing Feedback / Holocaust Essay (genocide subject) [5]

For me the hardest part of an essay is the first paragraph. In my AP Lang class we are doing an essay on a genocide, so I chose the Holocaust. Well, this is what I have so far for my first paragraph;

Animosity. Disgust. Unadulterated, genuine barbarism; the psychopathic foundation on which the Holocaust and its' perpetrators were based on. By dehumanizing large masses of people, entire religions and to just a few words- it, them and they- it allowed 8.5 million Nazi soldiers to annihilate, exterminate and decimate two-thirds of the European Jewish populations, committing the worst genocide the modern world has bared witness to.

Any tips to help me continue?