(September 29, 2015, 11:34 AM EDT) -- OKLAHOMA CITY — The Chickasaw Nation and The Choctaw Nation, which had sued the U.S. Department of the Interior (DOI) alleging that the U.S. government has never provided an accounting for its management of various assets that belong to the nations, including oil and gas leases, on Sept. 24 reached a joint stipulation with the DOI to drop the case in exchange for a combined payment of $186 million (The Chicakasaw Nation, et al. v. The U.S. Department of the Interior, No. 05-01524, W.D. Okla.)....