Final answer:
The end of the Indian Wars was marked by the Battle of Wounded Knee in 1890, where approximately 200 Sioux were killed after surrendering their weapons.
Step-by-step explanation:
The "battle" that marked the end of the Indian Wars where 200 Sioux were slaughtered after turning in their weapons was the Battle of Wounded Knee. In 1890, the Lakota people were performing the 'Ghost Dance' on their reservation in South Dakota, which led to an uprising. When the 7th Cavalry caught up to the Lakota Ghost Dancers at Wounded Knee, the Lakotas prepared to surrender, but an accidental rifle discharge led the U.S. soldiers to begin firing indiscriminately, resulting in the massacre of about 150-300 Sioux men, women, and children.
This tragic event occurred on December 29, 1890, when a group of Sioux were surrounded by U.S. troops at Wounded Knee Creek in South Dakota. During the disarming process, a shot was accidentally fired, resulting in U.S. troops opening fire on the unarmed Sioux, leading to the death of an estimated 300 Sioux men, women, and children in a massacre that signaled the closing chapter of the centuries-long conflict between Native Americans and European settlers.