2012 Kandahar massacre - 16 women and children in Kandahar, Afghanistan slaughter by one American solider
1999 Bombing of Yugoslavia by US - Confirmed to have killed 400 civilians (some sources place this figure at over 1,000 or as high as 5,000)
1968 My Lai Massacre - U.S. soldiers murdered, tortured and assaulted 347–504 unarmed South Vietnamese villagers age ranging 1 to 81 years old - mostly women and children.
Note- South Vietam was ally of the US during US invasion of Vietnam. Friendly fire?
1963 Bombing of Hiroshima and Nagasaki - 200,000+ civilians killed. US reason:
bomb them to hell to save them.
1950 No Gun Ri Massacre of South Korean allies - South Korean refugees were killed by by the 7th U.S. Cavalry Regiment. 400 civilians were killed whilst the U.S. Army cites the number of casualties as "unknown".
Note- South Korea was ally of the US during Korean war. Friendly fire?