But it is a reason that eludes that strain of U.S. academia that first defines war as something that nations and groups other than the United States do, and then concludes that war has nearly vanished from the earth.
Since World War II, during a supposed golden age of peace, the United States military has killed some 20 million people, overthrown at least 36 governments, interfered in at least 82 foreign elections, attempted to assassinate over 50 foreign leaders, and dropped bombs on people in over 30 countries. The United States is responsible for the deaths of 5 million people in Vietnam, Laos, and Cambodia, and over 1 million just since 2003 in Iraq.
For the past almost 16 years, the United States has been systematically destroying a region of the globe, bombing Afghanistan, Iraq, Pakistan, Libya, Somalia, Yemen, and Syria, not to mention the Philippines. The United States has "special forces" operating in two-thirds of the world's countries and non-special forces in three-quarters of them.