Question

Why did the Louisiana purchase caused this?

Jefferson took a strict, literal view of constitutional powers, meaning that specific
powers reserved for the President and Executive Branch needed to be spelled out in
the Constitution. The ability to buy property from foreign governments was not among
these powers listed in Article IV of the Constitution - a fact that his political
opponents, the Federalists, were eager to point out to the President.

Answer 1

Since the Louisiana Purchase directly violated Jefferson´s own political principles of the Democratic-Republicans for which took a strict view of the constiution, Jefferson had to retreat his own principles to make this point.