In the long and bitter prelude to war, southern transplants dominated California government, keeping the state aligned with Dixie. However, a murderous duel in 1859 killed Free Soil U.S. Senator David C. Broderick, and public opinion began to change. As war broke out back east, a golden-tongued preacher named Reverend Thomas Starr King crisscrossed the state endeavoring to save the Golden State for the Union. Seventeen thousand California volunteers...