"This is conquered land." The Dakota woman's words, spoken at a community meeting in St. Paul, struck Nora Murphy forcefully. Her own Irish great-great grandparents, fleeing the potato famine, had laid claim to 160 acres in a virgin maple grove in Minnesota. That her dispossessed ancestors' homestead, The Maples, was built upon another, far more brutal dispossession is the hard truth underlying White Birch, Red Hawthorn , a memoir of Murphy's search...