What is the meaning of the sweetest girl music video?

It is about a girl in a refugee camp who is being deported back to her own hostile country

in which of course she doesn't want to go. Wycleff in the beginning is sent on a mission to make sure she does not get deported. Akon and Lil Wayne are also refugees in the camp waiting to hear if they will get deported. in the end u see the "sweetest girl" light the camp on fire and run away along with the other refugees. That is when Wycleff Jean tries to run and defend her from the guards chasing after them. He flips a guard and successfully finds the girl. in the end they run out of the screen together and the camp combusts in fire.