Before President Snow became the president of Panem, he was first a rich boy named Coriolanus Snow.
He is a son of a once was richest family in Panem. But the people of Panem hated his family so much because of such wealth, and because of his father(Carlontuse Snow) being such a womanizer.
People are so mad that they burned their mansion down to the grounds. They thought they killed everyone inside but what they didn't know is that Coriolanus was still alive. He survived the fire. And from that day on he promised himself that he would put the country into a game of killing. To kill, for entertainment of other rich families that was a friend of his family.
He became the President of Panem and divided the country into 13 districts and the Capitol. He also established "THE HUNGER GAMES" which is his plan of revenge for his dead parents.