The foreigners that brought it were the English colonists, going on four centuries ago.
Or possibly the Conquistadors.
Can’t lay this one on the Mexican/Central American/Mestizos/Indios.
You can lay it on them for bringing old controlled diseases back in.
Agreed. The plague is an old-world disease. My point is more general: We will be seeing many more disease outbreaks now that there are no border controls.
As you know, Ellis Island had health inspectors. They were able to catch at least some problems.
What occured in the past was fixed in the past. Currently, the diseases are brought in from the outside, just like before, but by a different set of people who didn't fix their problem in the past.