Most mothers teach their kids to brush their teeth and study hard; my mother, a refugee from Nazi Germany, counseled me on strategies for surviving dictatorships. “Never register with the police, if you’re required to,” she frequently advised, and also, “It’s a good idea to have more than one passport.” Oddly enough, my mother, who died in 1977, had no passports. After growing up in Hitler’s Berlin, she had no intention of ever leaving what she considered to be the safety of the United States. For years, I shared that opinion. I was born in West Harlem in 1944. I...