America's Second-Longest War
What is it? I bet you didn't guess. I had forgotten it, too, till I came upon the chapter about it in Daniel Walker Howe's excellent new period history, "What Hath God Wrought." The Wikipedia article, on a quick read-through, looks fair, substantial, and rooted in good sources. It's not pretty. As nothing is from the U.S. Indian relations in the Jacksonian era.