Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Jefferson National Expansion Memorial is in St. Louis, Missouri, near the starting point of the Lewis and Clark Expedition. It was designated as a National Memorial by Executive Order 7523, on December 21, 1935, and is maintained by the National Park Service. The park was established to commemorate the Louisiana Purchase, and the subsequent westward movement of American explorers and pioneers,the first civil government west of the Mississippi River,the debate over slavery raised by the Dred Scott case.