Final answer:
The basis for the American Red Cross was significantly shaped by the volunteer efforts of women and medical professionals like Charles Drew, who developed crucial blood storage techniques. These contributions were critical during times of war and crisis, despite challenges like racial segregation.
Step-by-step explanation:
The volunteer medical efforts that formed the basis for what would become the American Red Cross were significantly shaped and supported by women during times of war and crisis. For instance, during World War II, women volunteered to pack and ship medical supplies and prepare care packages for prisoners of war, as well as to serve as nurse's aides, which provided additional support to hospital staffs dealing with personnel losses. Moreover, prominent individuals like Charles Drew, an African American physician, contributed to medical advancements such as the development of blood plasma storage techniques, which were utilized by organizations like the Red Cross. Despite facing challenges such as racial bias during segregative times, these volunteer efforts and medical advances played a crucial role in the establishment of the American Red Cross and its humanitarian mission.