There are poorly documented suggestions that Spanish missionaries, soldiers, and explorers came through the area beginning in the mid-1600s. The whole region was called "Teguayo" and "Lake Copalla" (Utah Lake) appear on maps of Spanish Nuevo Mexico. Spanish and then Mexican land claims remained until the Treaty of Guadalupe Hidalgo which ended the Mexican War in 1853 and ceded the whole of northern Mexico to the United States including a few thousand Mormon settlers who had taken up residence in July 1847.