All of the conflicts in the Mormon War occurred in a corridor 100 miles (160 km) to the east and northeast of Kansas City, Missouri.As a result of the war, nearly all Mormons in Missouri, estimated at more than 10,000, were forced to leave the state.
When about thirty Latter Day Saints approached the polling place, a Missourian named Dick Weldon declared that in Clay County the Mormons had not been allowed to vote, "no more than negroes." One of the Mormons present, Samuel Brown, claimed that Peniston's statements were false and then declared his intention to vote. A number of Missourians left the scene to obtain guns and ammunition and swore that they would "kill all the Saints they could find, or drive them out of Daviess County, sparing neither men, women or children." The crowd dispersed, and the Mormons returned to their homes.According to an article in the Elders' Journal – a Latter Day Saint newspaper published in Far West – "The Saints here are at perfect peace with all the surrounding inhabitants, and persecution is not so much as once named among them..." In 1837, problems at the Church's headquarters in Kirtland, Ohio, centering on the Kirtland Safety Society bank, led to schism.The Church relocated from Kirtland to Far West, which became its new headquarters.Tensions rose in Clay County as the Mormon population grew.In an effort to keep the peace, Alexander William Doniphan of Clay County pushed a law through the Missouri legislature that created Caldwell County, Missouri, specifically for Mormon settlement in 1836.In 1834, Latter-day Saints attempted to effect a return to Jackson County with a quasi-military expedition known as Zion's Camp, but this effort also failed when the governor failed to provide the expected support.