The American Civil War was disastrous for the Muscogee people. The first three battles of the war in Indian Territory occurred when Confederate forces attacked a large of neutral Muscogee (Creeks) led by Opothle Yahola. For the majority of the Muscogee people, desired neutrality proved impossible. Eventually Muscogee citizens fought on both the Union and Confederate sides. The reconstruction treaty of 1866 required the cession of 3.2 million acres -- approximately half of the Muscogee domain.
Here is a link to our histoy: http://www.muscogeenation-nsn.gov/history/history.htm