Aaron Burr was arrested... not for the reason you think!

In 1807, Aaron Burr, known for killing Alexander Hamilton, faced no charges for the duel. However, he was later arrested for attempting to secede from the Union with a private militia in the Louisiana Territory. Burr claimed he was preparing for a potential war between the U.S. and Spain to seize Mexican land. Despite President Jefferson's disapproval, the Supreme Court found no evidence against Burr, leading to his release.

What was Burr's justification for bringing a private militia to the land he bought?

What was the outcome of the charges against Burr according to President Jefferson?