No offense to Rep. Hartzler, but there isn't any evidence is coming across the boarder. There as much in Canada as there is in the US, but they don't share a border with Mexico. We don't share a border with India, where the Delta variant started, but here we are. Here's an article from USA Today, a fairly safe and middle of the road newspaper. https://www.usatoday.com/story/news/health/2021/07/21/lambda-variant-covid-identified-texas-hospital-what-know/8039406002/
I think we forget that in the past pandemics, medicine was nonexistent. I mean, in the Spanish Flu outbreak in 1919, we had aspirin. That's it. Ventilators weren't much more than a concept and prototypes until 1940. Between vaccines and antibiotics, we've been pretty good for 100 years in first world countries. Luckily, SARS 1 was only contagious in it's end stages, which is why so many hospital workers got it. Ebola was mist contagious from dealing with dead bodies, something we don't do much of here.
Plague: treatable
TB: treatable
Polio: gone for us
Measles/Mumps/Rubella: gone thanks to vaccines
Flu: vax, treatable anti-virals, but still deadly for the young, old, immune-suppressed, etc.
Polio: gone to vax
Small Pox: gone to vax
Monkey pox: still in labs and Africa (finger crossed)
Chicken Pox/Shingles: gone to vax (shingles is nasty and random, btw. Had it in my early 30s and still have nerve damage on my right shoulder blade 15 years later)
COVID will hopefully be gone to vax in the next few years.