Why was there such a high casualty rate in world war 1?

The high casualty rate in World War I was primarily due to the combination of advanced military technology and static trench warfare. The use of machine guns, artillery, and gas warfare made traditional infantry assaults deadly, while the trench system led to prolonged stalemates. Additionally, the war’s scale and global involvement meant that battles often involved massive troop concentrations, resulting in significant losses. Poor medical care and the lack of effective treatments for injuries and diseases further exacerbated the casualty numbers.