Democide is when a person/people are killed by the government.

the leading cause of death in the world is DEMOCIDE. Democide is death via government. It is estimated to have killed more then 750 million people.

It is unclear exactly what the question is asking. There was nothing major going on in Cambodia other than the genocide.

The Cambodian genocide is actually a democide, not a genocide, which means that it was government sanctioned killing of citizens, but these citizens were not chosen on the basis of their race, religion, age, sexual orientation, etc. The democide came as a result of massive communal farms and the repetitive murder of those who resisted farming or failed to meet the quotas. These massive communal farms covered the majority of the country and entire cities were depopulated in order to work the fields. Those people who remained in the cities were typically there because they were part of the Cambodian bureaucracy and were necessary to run the country.

The Khmer Rouge committed the "Cambodian Genocide", but the name is a misnomer and the reason for this is specifically why it does not fit the classic definition of a genocide. The elimination of over 1.5 million Cambodians is more properly called the "Cambodian Democide". The distinction is that a genocide is a specific targeting of a group for extermination based on some inherent characteristic (race, ethnicity, sexual orientation, political leanings, etc.). The Khmer Rouge killed anyone who disagreed with the aims of the regime or was unable to comply with the arbitrary and ridiculous standards required by the regime. Therefore, their actions do not target a specific group and are not a genocide. A democide is simply mass killing performed intentionally by a regime, without regard to inherent characteristics.

The Cambodian genocide is not a proper genocide, but rather a democide, where the government kills citizens irrespective of their race, religion, or other defining aspect. However, since the democide resulated from the creation of massive rice paddies and unrealistic quotas, the first to die en masse were usually educated people from the cities. Additionally, the political dissidents who opposed this plan were also educated. Therefore the educated, city elites were most devastatingly hit as a group, but it was not "intended" that way. hundreds of thousands of very poor Cambodians also were tortured and murdered. Also, Khmer (the dominant ethnic group in Cambodia) were just as often targeted (per capita) as ethnic minorities.