From The Collaborative International Dictionary of English v.0.48 [gcide]:
Empire State of the South \Empire State of the South\
Georgia; -- a nickname.
[Webster 1913 Suppl.]
From WordNet (r) 3.0 (2006) [wn]:
Empire State of the South
n 1: a state in southeastern United States; one of the
Confederate states during the American Civil War [syn:
Georgia, Empire State of the South, Peach State,
GA]