Unfortunately, beginning in 1921 and 1922, the boll weevil, which had come from Central America and had been marching across the South since the turn of the century, finally arrived in Edgefield County, devastating the cotton crop on which the economy was almost entirely based. Farmers saw their production of cotton plummet by as much as 90 percent. Lands which had been devoted to cotton for more than a century were allowed to go idle. Sharecroppers, no longer able to make a living, left the farms and many left the state. Throughout the 1920s farm incomes sank; merchants, unable to collect accounts from destitute farmers, were squeezed; banks failed. Then, when it seemed as if economic conditions could not get worse, the 1929 market crash and the Great Depression further impoverished the county. The population of Edgefield County began to decline and continued to decline in every census from 1920 to 1970.