World war one introduced the concept of Total war. This concept involved the countries economy, population and government in the large scale warfare.
With Countries sending all their men to war the women filled in the rolls of the men in the factories.
Because of the Industrial Revolution Machines and guns were made in mass quantities. Shown below are some of the mass produced machines for the war effort.
With the entire country focused on the war many advancements in warfare were made. Guns began to hold more bullets and were shot faster. Then with including spirals in the barrel they became more accurate and were able to shot over greater distances.
The Machine Gun was only one advancement made during WWI that changed warfare forever. Through the total war concept advancements in technologies and strategies was made left and right all to help the war effort.