Usopp was born in a village called Syrup Village.
He grew up with no father because his father was a pirate and his mother died of sickness when he was young.
As he grew older, he wanted attention after being alone for so long, and became a carbon copy of the boy who cried wolf, but he'd cry for pirates.
When luffy came along, Low and behond, a group of pirates started to rob his village and nobody believed they were there. Luffy , Zoro , Nami and Usopp
had to stop the pirates alone.
After this, Usopp joined the straw hat pirates and became One of the best snipers in the world, using is trusty slingshots.