14. Rwanda
Death toll: between 800 000 and 1 million people
One of the most brutal genocides of the 20th century happened in Rwanda in 1994. The conflict occurred between Hutu and Tutsi population, in which Hutu slaughtered around 1 million Tutsi using mostly machetes. Rwanda is just one of the many countries involved in genocide today and last 100 years, as you will see through the article.