Final answer:
The Wounded Knee Massacre occurred on December 29, 1890, in South Dakota. Around 300 Sioux men, women, and children were killed during the attack, along with a dozen US troops who were mostly killed by their own comrades.
Step-by-step explanation:
The Wounded Knee Massacre occurred on December 29, 1890, in present-day South Dakota. A group of Sioux was surrounded by US troops and as the troops took their weapons, a shot was fired, leading to confusion and heavy fire from automatic weapons. It is estimated that around 300 Sioux men, women, and children were killed during the attack, along with a dozen US troops who were mostly killed by their own comrades.