War on terror

Sept. 11 Legacy: One Endless War Against Many Radical Enemies

In the quarter-century from the end of the Vietnam War in the 1970s until Sept. 11, 2001, the United States rarely went to war, and when it did, the conflicts were so brief they were measured in days. The Gulf War in 1991 lasted 43 days. Airstrikes in the former Yugoslavia in 1995 went on for 22 days, followed by another round in 1999, that time for 78 days.

But since the Sept. 11 attacks, the United States has been fighting every single day for 15 straight years, the longest unbroken period in American history. The U.S. has carried out airstrikes, sent in ground forces, or both, in seven countries stretching from Pakistan in the east to Libya in the west. None of these conflicts has been resolved, and all signs point to years of strife ahead.