John F. Copper is the Stanley J. Buckman Professor of International Studies at Rhodes College in Memphis, Tennessee. He is the author of more than thirty books on China and Taiwan.

A spate of articles, op-eds and comment pieces have appeared in the U.S. press and academic journals in recent months arguing that Taiwan is not important to America and/or isn’t worth fighting China over, that the United States cannot afford to spend more on its military (which it has to in order to protect Taiwan), and that Taiwan should be abandoned.

Some, a lot fewer, have come to Taiwan’s defense and argue otherwise.

There are numerous arguments to be made that Taiwan is an ally that should be kept. It is a democracy. It is sovereign. It is faithful to the United States, etc.

The critical case to be made, however, is—or at least should be—that Taiwan is strategically important to the United States.

I believe there are two good arguments to be made for Taiwan’s strategic importance: One comes from looking at the history of the United States. The other from geopolitics...