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We derive a new version of the non-Abelian Stokes theorem for the Wilson loopin the SU(N) case by making use of the coherent state representation on thecoset space $SU(N)/U(1)^{N-1}=F_{N-1}$, the flag space. We consider the SU(N)Yang-Mills theory in the maximal Abelian gauge in which SU(N) is broken down to$U(1)^{N-1}$. First, we show that the Abelian dominance in the string tensionfollows from this theorem and the Abelian-projected effective gauge theory thatwas derived by one of the authors. Next (but independently), combining thenon-Abelian Stokes theorem with a novel reformulation of the Yang-Mills theoryrecently proposed by one of the authors, we proceed to derive the area law ofthe Wilson loop in four-dimensional SU(N) Yang-Mills theory in the maximalAbelian gauge. Owing to dimensional reduction, the planar Wilson loop at leastfor the fundamental representation in four-dimensional SU(N) Yang-Mills theorycan be estimated by the diagonal (Abelian) Wilson loop defined in thetwo-dimensional $CP^{N-1}$ model. This derivation shows that the fundamentalquarks are confined by a single species of magnetic monopole. The origin of thearea law is related to the geometric phase of the Wilczek-Zee holonomy for$U(N-1)$. The calculations are performed using the instanton calculus (in thedilute instanton-gas approximation) and using the large $N$ expansion (in theleading order).Comment: 77 pages, Latex, 13 eps figures, a version to appear in Prog. Theor.  Phy

Non-Abelian Stokes Theorem and Quark Confinement in SU(N) Yang-Mills Gauge Theory