President James Monroe appointed Crittenden secretary of the Arkansas Territory in 1819. Crittenden served in this role through 1829. From July to December 1819, he served as acting governor while James Miller was delayed for an extended period en route to Arkansas Territory. Crittenden called the first territorial legislature into session and took responsibility for organizing the new territory. He amassed considerable political power. Crittenden was a primary leader in preparing the territory for statehood. He was appointed as United States Commissioner for negotiating the 1824 Treaty with the Quapaw Indians.
