The ideal way to stop community spread is to keep everyone more or less in their homes. Failing that, you can isolate communities from each other, and failing t

The ideal way to stop community spread is to keep everyone more or less in their homes. Failing that, you can isolate communities from each other, and failing that, you can isolate states and countries from each other. In principle, closing the border between Washington State and British Columbia is a good idea, just as closing the border between Washington and Oregon is a good idea. It just happens to turn out that it’s much easier to close the international border than the interstate border, and if you’re solving a problem, you typically do the easier parts first.