Why did NASA not send anymore people to the moon?

NASA halted crewed lunar missions after the Apollo program due to a shift in focus toward other priorities, such as the development of the Space Shuttle and the International Space Station. The high costs and risks associated with lunar missions, combined with changing political and public interest, led to a reallocation of resources. Additionally, the scientific community pushed for exploration of other celestial bodies, like Mars. It wasn't until recent years that renewed interest in returning to the Moon has emerged, particularly with the Artemis program.