What are the reasons for the success of eugenics in the U.S.?

What are the reasons for the success of eugenics in the U.S.?

There were a number of reasons for the success of eugenics in the U.S. (1)First, it appealed to a wide variety of modern American intellectuals. (2)Second, the U.S.'s particular historical circumstances in the early twentieth century helped further explain the ideology that promised to increase national competitiveness and efficiency. (3)Finally, Americans accepted eugenics because it provided them with a theory that supported racism around the turn of the twentieth century.
【评分参考】本题共分三个采分点,(1)占1.5分,(2)占2分,(3)占1.5分考生只要答出其中的大意即可,答题语言不要求一致