I wrote today about the importance of borders in light of this crisis:

President Donald Trump announced a restriction on travel from Europe in a mid-March Oval Office address, European Union officials erupted in outrage.

The president of the European Commission, Ursula von der Leyen, issued a joint statement with the president of the European Council thundering, “The coronavirus is a global crisis, not limited to any continent and it requires cooperation rather than unilateral action.”

Just a few days later, von der Leyen advanced her own proposal to ban nonessential travel into the EU.

We are all restrictionists now. In the coronavirus crisis, everyone realizes the importance of borders, even the people who not long ago were ideologically hostile toward them.

Borders mark off the sovereign territory of one people from another. They are a means — if they can be enforced and defended — for a sovereign state to protect its people from invaders and unwelcome immigrants and goods. They are a tool almost every nation has used to try to keep the coronavirus from gaining a foothold in its population and to try to keep it from spreading further.