America's wars will change as the enemies of tomorrow, whether extremist networks or hostile nations, acquire the ability to strike more directly at the United States. The way Americans think about armed conflict must evolve to incorporate this profound change to the nature of security. After the devastating Thirty Years War of the 17th century, the great powers of Europe narrowed their notion of what was acceptable in war. While seldom applying their new standards during often-brutal colonial conquests, the European powers—at least in wars among themselves—deemed it acceptable to kill enemy combatants but not civilians, to destroy enemy war […]
