Final answer:
The Treaty of Paris in 1763 brought the Florida parishes into Louisiana.
Step-by-step explanation:
Following the Seven Years' War, the Treaty of Paris in 1763 marked the transfer of the Florida region from Spain to Great Britain. However, as part of a secret agreement in 1764, Britain exchanged the Florida parishes (which included areas like Baton Rouge and the surrounding region) with Spain in return for Havana, which the British had captured during the war. This transfer aligned the Florida parishes with Spanish Louisiana.
For several decades, these parishes remained under Spanish control until the early 19th century when, in 1810, a group of West Floridians rebelled against Spanish rule. This led to the establishment of the short-lived Republic of West Florida. Eventually, in 1812, the United States annexed the area and incorporated it into the Louisiana Territory, solidifying the Florida parishes as a part of Louisiana.
Correct Answer: The Treaty of Paris in 1763 brought the Florida parishes into Louisiana.