Opposition to the U.S. Export-Import Bank (Ex-Im) is now at the point where the bank’s reauthorization is genuinely in doubt. Spurred by accusations of corporate welfare, crony capitalism and outright corruption, opponents believe the Ex-Im Bank’s palpable violation of free-market principles fully warrants its early demise. The Ex-Im Bank’s critics have their economics entirely correct, but they have their geopolitics wrong. Their solution — simply terminating the bank — is appealing but counterproductive. What America should do, under a president with the wit to do it, is negotiate the global elimination of “export credits” (as these subsidies are generically known)....