There is no president of a state. The President of the US is over all 50 states. A governor is the head of a state. Louisiana has never been an independent country and has never had its own president or king or emperor. Before it belonged to the United States it was ruled by Spain and France at different times.
No president "discovered" Louisiana. Thomas Jefferson purchased it from France.
James Madison was the president in 1812 when Louisiana became a state.
President Thomas Jefferson sponsored the Louisiana Purchase. The purchase of the Louisiana territory occurred in 1803 and dissolved in 1804.
James Madison was president when Louisiana became a state on April 30, 1812.
Thomas Jefferson
The Louisiana Purchase
Thomas Jefferson was the President of the United States when the Louisiana Purchase occurred. Jefferson was president from 1801 to 1809.
Louisiana is under Napoleonic Law
Thomas Jefferson was the president when the United States acquired the Louisiana Territory. The territory was purchased from France in 1803, in what is known as the Louisiana Purchase.
Zachary Taylor
Monroe, Louisiana was named after a steam boat that was named after President James Monroe. (I don't think any president was named from a city in LA or elsewhere. )
There has been no President born in Louisiana. OTOH, Zachary Taylor was a Louisiana resident, though born in Virginia.