The Theodemocratic Commonwealth of the Mormon Confederacy

Overview
The Theodemocratic Commonwealth of the Church of Jesus Christ of Latter Day Saints, or more commonly known as the Mormon Confederacy internationally. A leader in economy, and a major supporter of capitalism with it's small government. Around 95% of the nation is LDS.

It grew through peaceful conversion of Natives and the lands that they own, allowing newly acquired lands to be majorly self-governing.

History
The Mormon Confederacy was officially founded in 1856, declaring independence from the (Mexican) government, owning all the Mexican lands excluding California, but that was acquired 1866. Many years passed as the TDC bought the Mormon populated states of Baja California, Oregon, Idaho, and Washington. During the collapse of the USA, they acquired the lands of the Great Plains. They stayed exactly the same until present day.