Green Grow the Lilacs is a love story set in a community on the brink of change: farmers crowding cowboys, Indians assimilating with settlers and Oklahomans pondering the controversial question of the territory’s statehood. In 1931, Lynn Riggs, part Cherokee himself, wrote about people whitewashed by Rogers and Hammerstein for 1940s’ audiences in their musical adaptation, Oklahoma!, which eclipsed the original. Under the direction of Native American dramaturgist Christy Stanlake,...