It restricted the admission of foreigners into the United States.
The statement that best explains the Emergency Quota Act is that the Emergency Quota Act aims to restrict the admission of foreigners into the United States. The Emergency Quota Act passed in 1921 and, while it was thought as a temporary measure to address the mass migration to the States, it changed drastically the way in which migration policies where though, as it introduces a numerical limit for migrations and a quota system to establish this limits.