The most accurate response regarding the aftermath of the Sand Creek Massacre is: The U.S. government came to condemn the incident because so many women and children were murdered.
The Sand Creek Massacre, which occurred in 1864, involved the brutal killing of a peaceful encampment of Cheyenne and Arapaho people, including many women and children, by Colorado Territory militia. The horrific nature of the event eventually led to public outrage and condemnation, and it played a role in shaping public opinion about U.S. policies toward Native Americans.