Final answer:
Total war became necessary as a result of changes in warfare and the need to mobilize all resources. In total war, armies target both military and civilian assets to weaken the enemy. This shift was seen in conflicts like World War I and World War II, where there were no restrictions on weapons and the impact of combat extended to civilian life.
Step-by-step explanation:
Total war became necessary due to changes in warfare and the need for governments to mobilize all available resources. In total war, armies target both military and civilian assets to demoralize the enemy and disrupt their ability to wage war. This shift towards total war was seen in conflicts like World War I and World War II, where there were no restrictions on weapons or their targets and the impact of combat extended to civilian life. The increasing power of weaponry, such as machine guns and artillery shells, made it possible for a small number of individuals to cause widespread destruction.