The story behind the genocide begins with colonialism. The split between Hutus and Tutsis arose not as a result of religious or cultural differences, but economic ones. "Hutus" were people who farmed crops, while "Tutsis" were people who tended livestock.

Congo

Burundi

Ugandan

Rwandan

What exactly do you mean 

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen