A case study of two brothers, Julius and Wilhelm Wagner, who immigrated to the United States from Baden, Germany. Julius immigrated as part of an early communist group, the Darmstadters or Forty, who established the utopian settlement of Bettina in 1847. His anti-slavery beliefs forced Julius to Mexico during the Civil War, but he returned to Texas after the war. His older brother Wilhelm fled Germany in 1851 as a result of his liberal political beliefs and settled in Texas. He founded a German-language newspaper when he moved to Freeport, Illinois. Using a newly discovered cache of Wagner family letters, Reichstein examines the lives of the brothers as they sought to make better futures for themselves on the new frontier. More than a narrow family history, however, German Pioneers on the American Frontier uses the individual cases of Julius and Wilhelm Wagner to examine the broader historiographical debate about assimilation and acculturation. The question it raises is whether the United States is a collection of separate immigrant cultures or whether those cultures become assimilated in the famous melting pot. Reichstein’s conclusion, based on the experiences of the Wagner brothers and their descendants, is that immigrants identify themselves as American through a variety of processes that are a combination of assimilation and acculturation.