Genocides

After Hitler came into power in 1933, Germany's Nazi party gained popularity and they implemented a highly organized strategy of persecution, murder, and genocide aimed at ethically "purifying" Germany, a plan Hitler called, "final solution". Six million Jews and Five million Slavs, Roma, disabled, Jehovah's Witnesses, homosexuals, and political and religious dissidents were killed during the Holocaust. A French Prosecutor at the Nuremberg trials explained, "This was a crime so monstrous,  so undreamt of in history... that the term genocide has had to be coined to define it."

After this one would think people would learn from this and to be better but things only escalated from here. In 1975 The Khmer Rouge took control of the Cambodian government, with the goal of turning the country into a communist agrarian utopia. However, they emptied the cities and evacuated millions of people to labor camps where they were starved and abused. It was estimated that between 1.1 million and 2 million Cambodians died during the 4-year reign of the Khmer Rouge, with little to no outcry from the international community.

In Guatemala, civil wars still existed in the 1960s due to inequalities existing in economic and political life. In the 1970s the Mayans began participating in protests against the repressive government, demanding greater equality. In 1980, the Guatemalan army instituted "Operation Sophia" which aimed at ending insurgent guerilla warfare by destroying the civilian base. Over the next 3 years, the army destroyed 626 villages, killed, or "disappeared" more than 200,000 people and displaced an additional 1.5 million, while more than 150,000 were driven to seek refuge in Mexico.  

The Rwandan genocide was one of the heaviest moments in human history. An airplane crash in 1994 carrying the presidents of Rwanda and Burundi provided a spark for an organized campaign of violence against the Tutsi and moderate Hutu civilians across the country. Approximately 800,000 Tutsis and Hutu moderates were slaughtered in a carefully organized program of genocide over 100 days. making history as the quickest killing spree the world has ever seen.