On June 3, President Joe Biden finally announced his plan to send part of America’s vaccine stockpile overseas. The first step, he declared, is to share some 25 million doses with other countries. At least three-quarters of those shots will go to COVAX, the international effort intended to route vaccines from rich countries to poor ones. The United States will dispatch the remainder to “countries experiencing surges, those in crisis, and other partners and neighbors, including Canada, Mexico, India, and the Republic of Korea,” as Biden put it.