In the interest of compiling a complete history of white trash, I have researched all of the names used in conjunction with this phenomenon and the dates they were first used. Some had been in use in England prior to this date, but this is the first known recorded usage of these terms in North America. (I must say that it brings a tear to my eye to be of such service to my white trash heritage.)
bumpkin.........1570
yahoo...........1726
cracker.........1766
yokel...........1812
poor white......1819
redneck.........1830
white trash.....1831
clayeater.......1841
dirteater.......1844
sandhiller......1848
cowboy..........1849
hayseed.........1851
buckwheat.......1866
rube............1896
hillbilly.......1900
hick............1920
bubba...........1922
sharecropper....1923
peckerwood......1929
Okie............1938