Why was World War 1 considered a new kind of war deadlier than any war before?

World War I was considered a new kind of war due to the introduction of advanced technologies and industrial warfare, which included machine guns, tanks, and chemical weapons. These innovations led to unprecedented levels of destruction and casualties, with millions of soldiers and civilians killed or injured. Additionally, the scale of the conflict involved multiple nations and vast battlefronts, making it more widespread and devastating than previous wars. The trench warfare tactics used also prolonged suffering and created horrific conditions for soldiers.