William Deverell is Professor of History at the University of Southern California and director of the Huntington-USC Institute on California and the West. He is the author of "Railroad Crossing: Californians and the Railroad, 1850-1910" (1994) and "Whitewashed Adobe: The Rise of Los Angeles and the Remaking of Its Mexican Past" (2004). He co-authored "Eden by Design: The 1930 Olmsted-Bartholomew Plan for the Los Angeles Region" (2000) and "The West in the History of the Nation" (2000) and co-edited "California Progressivism Revisited" (1994) and "Metropolis in the Making: Los Angeles in the 19...