Even before the tide of settlement crested in most of Maine, some began to leave for The West. The first large-scale exodus was probably in 1816-17, spurred by the privations of the War of 1812, an unusually cold summer, and the expansion of settlement west of the Appalachian Mountains in Ohio. "Ohio Fever" as the lure of the West was initially called, depopulated a number of fledgling Maine communities and stunted the growth of others, even if the overall momentum of settlement had been largely restored by the 1820s, when Maine achieved statehood.