This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
On 21 May 1863, the movement that had grown out of the Millerite reinterpretation of the Great Disappointment formally organized as the Seventh-day Adventist Church in Battle Creek, Michigan, gathering scattered post-Disappointment Sabbatarian Adventist groups into a single denomination for the first time since Miller's own followers had dispersed after 1844.
The organizing body that met at Battle Creek brought together congregations that had spent nearly two decades holding the investigative judgment doctrine and Sabbatarian practice independently of one another, without a shared denominational structure to formally bind them. What the 1863 organization gave those scattered congregations was exactly that structure, a single body able to coordinate growth in a way no loose network of independent groups ever could.
What organizing at Battle Creek changed for Adventism's spread was scale. The new denomination tripled its membership to 16,000 by 1880 and reached 75,000 by 1901, growth that followed directly from the coordination the 1863 organization first made possible, turning a scattered post-Disappointment remnant into a denomination capable of sending its own missionaries abroad within little more than a decade of its founding.