Originally, the Louisiana Purchase was much smaller, but it ended up this vast area. The Spanish didn't recognize the purchase. Louisiana had bounced back and forth between Spain and France. The French weren't supposed to transfer it to an English-speaking nation, and they weren't supposed to transfer it without notifying Spain.
Wilkinson had a lot of high-powered influence in the United States, Spain and France. Wilkinson commissioned Pike, but what were his motives He had already sent men into New Orleans and Texas (still under Spanish control) on filibusters or spying missions. He was making contact with Spanish viceroys and selling information to Spain (U.S. military arrangements for 12,000).