After days of bloodshed in South Sudan, an uneasy truce is in effect in the world's youngest nation,where soldiers slaughtered dozens last week. South Sudan President Salva Kiir and Vice President Riek Machar appealed for calm after days of heavy fightingbetween their soldiers. Kiir and Machar have separate forces loyal to each side, but more on that later. The two rivals have been embroiled in a power struggle for years, with forces loyal to both engaging in battles and civilians trapped in the crossfires. Five years after seceding from neighboring Sudan, the fledgling nation got mired in yet another conflict -- this time on the anniversary of its independence. What initiated the latest clashes? Did they start over a Facebook post? Or was the violence triggered by an attack on a checkpoint? You asked, and we answered. What is happening in South Sudan? In 2011, South Sudan split from its northern neighbor, Sudan, in a contentious divorce brokered by int