Answer:
I didn't understand your question, but I'll try to answer it as best as I can. Well, the Reconstruction Era was defined by two racial perceptions - the Jim Crow laws and the Social Darwinism theories. Eugenics ideas would arrive in the early 20th century.
Explanation:
Between 1870 and 1900, almost 12 million people immigrated to the United States. Many of these immigrants were from Europe and Asia, and they found in America a safe place to live. However, just like in the European continent, the American social reformers were worried about these people, and the impact they could cause on the American race. This period is featured by the emerging of racial theories, specifically Social Darwinism conceptions. Conflicts and issues related to race were commons in American history, mainly in the south where the traces of slavery were strong. Racial segregation and marriage control were normal, but until the early 20th century, there was no scientific explanation or a justification for the bureaucratic apparatus. The social reformers would find answers in the Eugenics ideas. However, just Eugenics wouldn't be sufficient to explain and solve the problems of immigration and racial miscegenation.
