Changes

Wars have often been periods of great technological innovation as each side finds itself faced with the necessity of creating new methods of offense and defense to ensure national survival.   

Wars have often been periods of great technological innovation as each side finds itself faced with the necessity of creating new methods of offense and defense to ensure national survival.   

The [[American Civil War]], coming shortly after the [[Industrial revolution]] in the United States, introduced mechanized warfare to the world with accurate [[rifles]] metal [[warship]]s, [[railway|railroad]] transportation of forces and material, and instant communication via the [[telegraph]].   

The [[American Civil War]], coming shortly after the [[Industrial revolution]] in the United States, introduced mechanized warfare to the world with accurate [[rifles]], metal [[warship]]s, [[railway|railroad]] transportation of forces and material, and instant communication via the [[telegraph]].   

[[World War I]] (1914-1918) introduced air combat, [[chemical warfare]], [[submarine]] and [[tank (military)|tank]] warfare, and the large scale deployment of the [[machine gun]].   

[[World War I]] (1914-1918) introduced air combat, [[chemical warfare]], [[submarine]] and [[tank (military)|tank]] warfare, and the large scale deployment of the [[machine gun]].