In 1803, the Louisiana Purchase doubled the territory of the fledgling United States. Taking control of and defending the new territory, especially the culturally heterogeneous city of New Orleans occupied much of the administration's time. Most of the burden for establishing the defense policy rested on William C. C. Claiborne, a staunch Jeffersonian, former member of Congress from Tennessee, and previous governor of the Mississippi Territory. By working with local business leaders with a stake in American success, observing the local customs and traditions, and gradually encouraging political participation, Claiborne successfully introduced the American militia system to a culture far different from that of his native Virginia. Claiborne's policies reduced the likelihood that local dissidents and foreign powers such as Spain and Great Britain could conspire to subvert American government in Louisiana by rebellion and invasion.

William C. C. Claiborne found himself a stranger in a strange land. Almost more a colonial governor of a European power rather than an American statesman, Claiborne grappled with maintaining a militia force for the Territory of Orleans, now the present day state of Louisiana. He built upon the volunteer companies he found within the city of New Orleans, but had little success molding the entire militia into an effective, efficient military force. Claiborne, hoping to use the fear generated by the January 1811 slave revolt to spur militia reform, maintained an active correspondence with the state's legislators, the area's military commanders, the members of the Louisiana congressional delegation, and even the President of the United States for assistance with militia matters. Ultimately, Claiborne failed and the British attack on New Orleans in 1814/1815 made the matter of reform academic.