Published in Verne Chatelain’s book The Defenses of Spanish Florida, 1565-1763, published by the Carnegie Institution of Washington (No. 511) Washington D.C. 1941.
This map emphasizes the important aspects of Spain’s attempts to claim, defend & control Florida during the Spanish period 1565-1763. After this period the English took possession for 20 years (1763-1783) under the Treaty of Paris, which ended the French & Indian War (or Seven Year War) between England and France. England took over Canada from the French and Spain received the Louisiana area. The Spanish gave up Florida in exchange for Havana, which had been captured by the English. Prior to the exchange of Florida, the Spanish had experienced difficulty maintaining their control of the area because of English encroachment on the north & French encroachment in the West. Both of the rivals traded extensively with the Seminole Indians and frequently encroached on the Spanish Territory in attempts to claim it for themselves. This had been going on for over one hundred years.
The northern boundary line is designated as the division between Spanish and English claims. The lower one is near the 31 degrees of latitude where the border is today. Both extend west to what is labeled “Rio de la Mourilla” which is probably the Apalachicola River.
Image in Chatelain book. Original manuscript copy in the Library of Congress.