Smith aimed to create Zion (the Heavenly city) at Kirtland. Smiths followers flocked to the area and in doing so bought land and houses. A Mormon temple was built there and the followers were asked to dedicate their property to the church.
10% of the Mormons income would go to help poorer Mormons settle in Kirtland.
The state of Illinois gave the Mormons their own Charter to set up Nauvoo as an independent state.
The Charter allowed them to:
Have their own council.
Set up their own laws (so long as it fell in line with US law).
Have their own army of 2000 men.
This made non Mormons feel very insecure.
The fear of the Mormons The fear of the Mormons The fear from the Mormon army The fear of Mormon practices such as Polygamy The fear of the Mormons political power Fear of being heavily outnumbered by Mormons.