in dawins time he saw lots slavery, seeing this he made a observation about humans that since the slaves were treated differently and were darker in color they were more like animals then whiite men where. and i agree with alex

Basically they are the same by definition expect Darwinism says new species will live for along time based on natural selection also the difference is in social Darwinism the idea is that the strongest and baddest species will survive and blossom iagree. Darwinism is how evolution is influenced by they environment and social Darwinism how nature chooses who is most fit.

both darwin and eugentics have the idea of the environment effecting the animal,they also share the idea of only the better creature may live,and the animal take certain aspects from their parents