A man runs through the streets waving a South Sudan national flag in celebration of the country's independence in Juba, South Sudan, late Friday, July 8, 2011. South Sudan became the world's newest nation at midnight. #

A girl from the Dinka Rek sub-tribe poses for a portrait in a remote cattle camp in Wunlit County, southern Sudan. Few women stay in cattle camps as the responsibility of grazing and protecting cattle often falls to young men. The role of cows to pastoral tribes like the Dinka is paramount. They are used for marriage dowries, currency and serve as the foundation of social status. The desire to possess large numbers of cattle for social purposes leads many young men to take part in violent cattle raiding, during which tribes or sub-tribes use modern weaponry to steal cows from neighboring communities. The prevalence of large scale cattle raiding remains of the major security challenges in newly-independent South Sudan. Photo taken on April 21, 2011. #

A group of internally displaced people from Abyei, huddle round a fire in a makeshift refugee camp in the village of Mayen Abun, southern Sudan on Thursday, May 26, 2011. Heavy fighting in neighboring Abyei earlier this week, had forced some thousands of people to abandon their homes and flee to Mayen Abun, from heavy fighting between northern and southern Sudanese forces which erupted earlier. #

People gather during independence celebrations in Juba, South Sudan, on Saturday, July 9, 2011. South Sudan raised the flag of its new nation for the first time on Saturday, as thousands of South Sudanese citizens swarmed the capital of Juba to celebrate the country's birth. #

Salva Kiir, the President of the freshly declared Republic of South Sudan, waves to supporters prior to declaring independence in the capital city of Juba on Saturday, July 9, 2011. #

A woman cries tears of happiness near the newly-unveiled statue of Dr. John Garang de Mabior, leader of the Sudan People's Liberation Army, before the independence ceremony of the Republic of South Sudan in Juba, South Sudan, on July 9, 2011. #

Southern Sudanese celebrate their first independence day in front of a statue of the late John Garang, the former leader of the Sudan People's Liberation Army, in the capital city of Juba on Saturday, July 9, 2011. #

Three young cattle keepers from the Dinka Rek sub-tribe pose for a portrait in a remote cattle camp in Wunlit County, southern Sudan. This group of Rek had gathered along the area's only remaining river as the dry season in southern Sudan pushed into its final weeks. As pastoral groups consolidate their herds at scarce water points, the frequency of raiding by other groups increases. In this remote camp, hundreds of young, armed men stood guard over more than one thousand head of cattle. The morning after this photo was taken, these and other Rek repelled a violent raid on their herds by a neighboring sub-tribe. The fighting left at least three people dead and several more badly wounded. Photo taken April 21, 2011. #

A woman prays as she holds a South Sudan flag and cross at the base of a statue of Dr. John Garang de Mabior, leader of the Sudan People's Liberation Army, before the independence ceremony in Juba, South Sudan, on Saturday July 9, 2011. #

An extended family member of Martha Abiem Deng poses for a portrait in a makeshift camp in Turalei, southern Sudan on Friday, May 27, 2011. The family traveled by foot from Abyei to Turalei, a journey that took more than two full days. The family was taken in by residents of Turalei who feed them despite extreme food shortages in the town. According to local officials in Turalei, approximately 80,000 residents of Abyei have sought refuge in neighboring Twic County, of which Turalei is the administrative capital. The mass exodus was prompted by a massive northern Sudanese military offensive on the disputed Abyei. Days of heavy fighting and bombardment left the northern military in effective control. #

A young cattle keeper from the Dinka Rek sub-tribe poses for a portrait in a remote cattle camp in Wunlit County, southern Sudan. He holds an AK-47 assault rifle, a common weapon among young cattle keeping males. This image was made at the border between southern Sudan's Lakes and Warrap states where cross-border cattle raiding is extremely common. Photo taken on April 21, 2011. #

A mother and her children who recently fled heavy fighting stand inside a schoolroom that has been transformed into a makeshift camp for displaced persons in the town of Khorfulus, Jonglei state, Southern Sudan. Photo taken on April 6, 2011. #

Southern Sudanese wave flags and cheer at the Republic of South Sudan's first national soccer match in the capital of Juba, on Sunday, July 10, 2011. The game, played against Kenya, took place just one day after South Sudan declared its independence from the north following decades of costly civil war. #

South Sudanese men sit on the wall of a soccer stadium in South Sudan's capital Juba during their country's first international football game against Kenya on July 10, 2011. #

A crowd of spectators erupt cheer as they celebrate their national soccer squad scoring the first goal of the match against Kenya's soccer club team Tusker FC at a soccer stadium in South Sudan's capital Juba, on July 10, 2011. The joy was short lived as the Kenyan squad scored 3 goals and defeated the home team 3-1. #

A South Sudanese man wears a shirt made of the new national flag during the Republic of South Sudan's first national soccer match in the capital of Juba, on Sunday, July 10, 2011. #