Which street is named for the last French official to govern Louisiana before American control?

The street named for the last French official to govern Louisiana before American control is Laussat Place. This is significant because Pierre Clément de Laussat served as the colonial prefect of Louisiana from 1803 until the transfer of the territory to the United States, marking the end of French colonial rule. His governance was short-lived, as the Louisiana Purchase took place later that same year, leading to a significant shift in control of the region.

This context underscores the historical relevance of Laussat in the transition from French to American administration. The other streets mentioned do not carry this specific historical association with the last French governance, focusing instead on different figures such as Ulloa, who was another French governor but not the last, and Galvez, who is celebrated for his contributions during the Spanish period in Louisiana. Dauphine Street, while historic, does not relate directly to French governance in the way Laussat Place does.