There's a long history in the US of govt officials muddying xenophobia with concerns about public health.
~ @prof_erikalee, historian and author of
"America for Americans: A History of Xenophobia in the United States."
Not so Asian Americans, who as @prof_erikalee pointed out, are seen as perpetual foreigners.
And then, in 1900, a case of bubonic plague was confirmed in Chinatown. The whole district was quarantined.
As @prof_erikalee said, white people were allowed to leave the area — but Chinese were not.
over the next few years, there were several campaigns to "disinfect" Chinatown — "basements were concreted, concrete ones flooded with carbolic acid, walls washed with lye, streets asphalted, cesspools filled[...] dwellings demolished."
go.nature.com/3aJ7oIL
Erika Lee said that on Ellis Island, in New York Harbor, immigrants from Europe were subjected to what were called "six-second physicals" — a quick perusal before entry into the US.