The United States pays France 15 Million Dollars for the land west of the Mississipi. This includes Oklahoma
Lieutenant James Wilkinson travels down the Arkansas River and reports his findings.
Wilkinson Enters Oklahoma
While this expedition did not enter Oklahoma, it was the first in the Louisiana Territory.
Lewis and Clark Expedition
George Sibley discovers vast amounts of salt in northern Oklahoma, this salt is vital to the frontier.
Sibley Finds Salt
While not being military, this expedition was perhaps the most important; with its vast amound of information on south-east Oklahoma
The most successful military expedition, Long collected vast info about Oklahoma and named it the "Great American Desert"
Stephen Long's Expedition
These expeditions would gather vital information on Oklahoma and its resources as well as its use to the United States. These explorers allowed many commercial traders to follow and make great amounts of income trading Native American goods.