The recent debate between Vice President Kamala Harris and the former President Donald Trump focused relatively little on foreign affairs. This was probably a good thing, as when the conversation ...

Does momentum matter in global affairs? If one country falls to hostile forces, will others follow? The domino theory — the idea that setbacks can accumulate quickly and catastrophically — is one of ...

Fifty years after the communist victory in Vietnam, the old domino theory seems to have been definitively replaced by a deeper conflict determined by history, power, and geography.