Based on this map, why was the Louisiana Purchase in 1803 a “risky” decision by President Jefferson?

Answer:
The decision was risky
Explanation:
The decision was risky because the U.S didn't know what laid on those borders towards the west coast and had to have that whole area explored and mapped, they bought it without knowing what the area was like.
So the president could have bought useless land and they wouldnt have known it, luckily it wasnt lol