Which weapon led to stalemate in the western front?

The introduction of machine guns during World War I played a crucial role in creating a stalemate on the Western Front. Their ability to deliver sustained and rapid fire made it extremely difficult for infantry to advance without suffering heavy casualties. This led to trench warfare, where both sides dug in and fortified their positions, resulting in prolonged deadlock and minimal territorial gains. The combination of machine guns, artillery, and barbed wire effectively hindered mobility and offensive operations, cementing the stalemate.