Why were there other crusades if the crusaders won the first one?

The First Crusade succeeded in capturing Jerusalem in 1099, but the Christian states established in the Holy Land were precarious and faced constant threats from Muslim forces. Subsequent crusades were launched to reinforce and defend these territories, respond to the loss of Jerusalem, and address internal divisions within Christendom. Additionally, the political and religious motivations of various leaders and the desire to reclaim lost lands spurred further military campaigns. These factors contributed to a series of crusades over the following centuries, despite the initial victory.