Yes, true - that’s how they were eradicated. We enjoyed a span of perhaps 20 or 30 years of relative calm with these once pervasive diseases - measles, TB, all manner of ills.
And it is true we’ve had illegals under most Presidents in modern history. However, Obama makes them look like a bunch of schoolboy prats when it comes to fostering the invasion of illegals with no protection for us at all with regard to our national immune system.
I agree that Obama is far worse, but all should be held accountable.