In the late 1740s the Pueblo tribes of the OTL Southwestern United States Banded together in order to protect themselves from raiding. In 1749 they officially formed a confederacy.
in the early 1750s the Pueblo Confederacy felt harassed by the Iberian Empire and a tense political situation began to raise. Both sides responded by stationing their armies at the border.
In order to avoid a bloody conflict the Pueblo drew up a treaty titled the Treaty of Isleta. The treaty negotiated peace and also made the Pueblo Confederacy a vassal of the Iberian Empire.
In 1768 the Pueblo Confederacy absorbed the Navajo tribes. In order to establish a balance of power two regional capitals were established one named Bear Lake in the Navajo region and Taos in the Pueblo region. Santa Fe was established as a joint capital.
In the late 1770's the Pueblo Confederacy engaged in a series of wars with the Comanche.