Jews are only human, and human nature is to conserve scarce resources for those already close to us. Yet history suggests that we fare best in open and expanding societies—golden age Spain, late medieval Poland, etc.—and suffer when nations close themselves up to all “outsiders.” It may not always start with us, but what is bad for any “Other” is ultimately bad for the Jews. We should work to liberalize immigration policy and attitudes in every nation we now call “home.”