For the (inflation-adjusted) price of the Louisiana Purchase, you could buy more than 81 million beignets today. Tasty. (Source)

Louis-André Pichon (French minister to the United States) was the guy responsible for securing passports for Lewis and Clark's 1804 expedition. They ended up being unnecessary, but still, it was a cool thing for him to do. (Source)

The original Louisiana Territory survey marker has its own park in Arkansas. (Source)

Robert R. Livingston's brother Edward ran away to New Orleans after being (falsely) accused of fraud, embezzlement, and other shady money stuff in New York. (Source)

The land included in the Louisiana Purchase eventually comprised all or part of these U.S. states: Arkansas, Colorado, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. Oh, and Louisiana. (Source)