The Collaborative International Dictionary of English v.0.48:

Statesmanship \States"man*ship\, n.
   The qualifications, duties, or employments of a statesman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

statesmanship
    n 1: wisdom in the management of public affairs [syn:
         statesmanship, statecraft, diplomacy]