U.S. closes it doors to polygamists

Due to huge increases in immigration to the United States, Congress passes the Immigration Act of 1891, moving the Bureau of Immigration under the Treasury Department and adding new categories of restriction, excluding those with contagious diseases, polygamists, and contracted laborers. Immigration advertising is also made illegal. The Secretary of the Treasury begins to regulate immigration inspections along the borders of Canada and Mexico and handles the deportation of immigrants who enter the U.S. unlawfully.