The Collaborative International Dictionary of English v.0.48:

Muskogees \Mus*ko"gees\, n. pl.; sing. Muskogee. (Ethnol.)
   A powerful tribe of North American Indians that formerly
   occupied the region of Georgia, Florida, and Alabama. They
   constituted a large part of the Creek confederacy. [Written
   also Muscogees.]
   [1913 Webster]