Why was Fort Randolph Built?

Historical marker location:

135 Riverfront Street, Pineville, Louisiana

( Marker can be reached from Riverfront Street, 1 mile north of Main Street, on the right when traveling north.)

Was there a third fort, Fort Alexandria?.

The Louisiana Purchase Exposition, also known as the St. Louis World's Fair, was held in St. Louis, Missouri, in 1904. The fair featured exhibits from around the world and introduced several new inventions and products to the public, including the ice cream cone and Dr Pepper soft drink.