The same year, William Z. Ripley used identical racial classification in "The Races of Europe" (1899), which would have a great influence in the United States. Other scientific authors include H.S. Chamberlain at the end of the 19th century (a British citizen who naturalized himself as German because of his admiration for the "Aryan race") and Madison Grant, a eugenicist and author of "The Passing of the Great Race" (1916). Madison Grant provided statistics for the Immigration Act of 1924, which severely restricted immigration of Jews, Slavs, and Southern Europeans, who were subsequently hindered in seeking to escape Nazi Germany.