What method was not used by the US between 1880 and 1920 to limit the number of immigrants?

Question

Quizplus · Accepted Answer

Between 1880 and 1920, the United States implemented various measures to limit immigration, including outlawing the practice of prepaying the cost of an immigrant's voyage in exchange for future labor services (indentured servitude), implementing a financial test to ensure immigrants could support themselves, and utilizing a literacy test to restrict immigration. However, there was no policy that allowed only immigrants who had family members in the US to come in. This type of policy, known as family reunification, became a significant part of U.S. immigration policy later in the 20th century, particularly with the Immigration and Nationality Act of 1965.

What Method Was Not Used by the US Between 1880