Why did David make the nations that he conquered pay him tribute in money or slaves?

David made the nations he conquered pay tribute in money or slaves to assert his dominance and ensure economic stability for his kingdom. This tribute served as a form of acknowledgment of his power and authority, reinforcing his position as a ruler. Additionally, the resources gained through tribute helped to support his military campaigns and the administration of his growing empire, fostering loyalty among his own people and enabling further expansion.