File:Arizona+Land+1860P.jpg

Summary
5 Apr 1860 - An unofficial convention held in Tucson established a provisional government,  declared the creation of the Territory of Arizona from the southern half of New Mexico Territory below 34 degrees north latitude and authorized 4 proposed counties: Castle Dome, Ewell, Mesilla, and Dona Ana. The US Congress rejected the idea, so the proposed new territory was never officially created. However for a time it did operate as the de facto government for the intended Arizona Territory.