Great compilation of attacks on US

Terrorist attacks and related incidents in the United States

complied by Wm. Robert Johnston
last updated 11 August 2016
Note: table includes terrorist events causing fatalities, incidents involving unconventional weapons, politically-motivated murders, and other incidents of political or methodological significance.
Type codes indicate category of attacks/incidents and (if clear) political nature of organization/individual behind the attack:

• TER = terrorist attack
• THW = thwarted terrorist attack
• CRI = criminal incident
• ACC = accident
  
• bws = Beltway sniper
• islm = islamist
• left = left-wing
• right = right-wing
• natl = nationalist
• unab = Unabomber
• rel = religious

For related listings more thoroughly vetted, see these pages:

• List of worst terrorist acts
• Incidents of mass casualty terrorism
• Terrorist and criminal attacks targeting children

See list here: http://www.johnstonsarchive.net/terrorism/wrjp255a.html