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The State of South Texas, colloquially known as South Texas, is one of the 45 states which makes up the United States of America. The state is bordered by North Texas to the north, the Mexican states of Nuevo León and Tamaulipas, to the south, and the Mexican states of Coahuila and Pecos to the west.
Historical, both North Texas and South Texas were one a part of the Mexican Empire as a territory known as Coahuila y Tejas. The territory was very sparsely populated, with fewer than 3,500 residents, and only about 200 soldiers, which made it extremely vulnerable to attacks by native tribes and American filibusters. In the hopes that an influx of settlers could control the Indian raids, the Mexican government opened their borders for immigration. Most of these new immigrants were from the southern United States and brought their slaves with them, despite the fact that Mexico abolished slavery in 1820. Tensions between American settlers in Tejas and the Mexican government would continue to brew until they erupted into the Texan Uprising.
The American settlers in the region would manage to gain control over most of modern day North and South Texas by mid-1836. Mexico continued refusing that Texas was nothing more than a territory in rebellion. The United States, under Andrew Jackson, would threaten war with Mexico if they did not recognize Texas. The two nations would continue to stand off until 1837, when the Russian Empire intervened to mediate a treaty to end the tensions. As part of the Treaty of Guadalupe Hidalgo, Mexico would relinquish all land north of the continental divide and east of the meridian 100° west. Despite desires to admit Texas a one state, the idea was shelved because of how sparsely populated Texas was at the time. As a result, Texas was divided into North and South along the Brazos and Colorado rivers.