Which of the following statements accurately describes immigration historically in the United States?
A) The use of ethnic and racial criteria to restrict the country's population first began with the passage of the Immigration Act of 1924.
B) After World War I, Congress passed the Immigration Act of 1924, which put into place a national origins quota system and resulted in nearly all immigrants from Asian and African countries being banned from admission.
C) In 1790, 81 percent of Americans traced their roots to Europe, mostly Britain and elsewhere in northern Europe.
D) All of the above