After Mexico’s war of independence against Spain started in 1810 and Mexico reclaimed all Spanish possessions (including the area controlled by the Utes), rivalry developed between Anglo-American traders in the area and Mexicans. After Mexico declared independence from Spain, the area officially became part of the Mexican territory and Mexicans were actively involved in Utah while making no threat to Ute claims on the land. This continued uninterrupted until 1847 and the arrival of the Mormons, followed by the United States annexation of the territory of Utah with the signing of the Treaty of Guadalupe Hidalgo in 1848.