Amerigo Vespucci was an Italian explorer and cartographer, and later became a Castilla citizen. He also participated in voyages for the Castilian and Portuguese crowns. Besides, he explained how Columbus's new discovered land was not part of Asia, but a separate continent. As a result, the New World was called after him.
The context of "in our own car" and "in the state of Louisiana" isn't necessary for the readers. It just becomes excessive words that hinder the reader from a smooth read.