Geronimo in the context of Arizona Territory

The Indian Congress occurred from August 4 to October 31, 1898 in Omaha, Nebraska, in conjunction with the Trans-Mississippi International Exposition. Occurring within a decade of the end of the Indian Wars, the Indian Congress was the largest gathering of American Indian tribes of its kind to that date. Over 500 members of 35 different tribes attended, including the Apache medicine man Geronimo, who was being held at Fort Sill as a United States prisoner of war.

Frank A. Rinehart's photographs of the Indian Congress participants are regarded as one of the best photographic documentations of American Indian leaders around the start of the 20th century.

The Apache Wars were a series of armed conflicts between the United States Army and various Apache tribal confederations fought in the southwest between 1849 and 1886, though minor hostilities continued until as late as 1924. After the Mexican–American War in 1846, the United States annexed conflicted territory from Mexico which was the home of both settlers and Apache tribes. Conflicts continued as American settlers came into traditional Apache lands to raise livestock and crops and to mine minerals.

The U.S. Army established forts to fight Apache tribal war parties and force Apaches to move to designated Indian reservations created by the U.S. in accordance with the Indian Removal Act. Some reservations were not on the traditional areas occupied by the Apache. In 1886, the U.S. Army put over 5,000 soldiers in the field to fight, which resulted in the surrender of Geronimo and 30 of his followers. This is generally considered the end of the Apache Wars, although conflicts continued between citizens and Apaches. The Confederate Army briefly participated in the wars during the early 1860s in Texas, before being diverted to action in the American Civil War in New Mexico and Arizona.