This book addresses an issue of international politics in which the Yucatan Peninsula was involved. It is centered on an event that occurred within the framework of the situation of suspicion, restlessness, uncertainty and rivalry in which, in the mid-18th century, diplomatic actions occurred in New Spain, in the context of the Bourbon reforms and the decline of the Spanish Empire in the face of the growing power of Great Britain. Spain remained committed to maintaining commercial control of Indian products and to prevent successive British attempts to expand its colonial power in the Caribbean. In the midst of this struggle, two English entourages entered Yucatan and reached the city of Mérida in 1765., date around which great technological, economic, social, political and cultural transformations were happening in Europe and America, and that, in England, opened the way to the Industrial Revolution, and that it coincides with the moment in which the British arranged to expand their invasions to the Spanish territories located in the South Atlantic. Hence the importance of studying the circumstances and details of these naval trips.