Korea could test their way out of it, because they started early enough to contain it. US is past that point now - the scale of testing that we need to catch all the heretofore undetected cases is much bigger. And we need to find those cases to switch from blanket measures to targeted ones.
In the end, that's likely what we'll have to do anyway. But it'll take longer than 3 months.
In the end, that's likely what we'll have to do anyway. But it'll take longer than 3 months.