Why did the Oklahoma Territory initially use Nebraska's code of laws

The Oklahoma organic act of 1890 created an organized incorporated territory of the United States of Oklahoma Territory, with the intent of combining the Oklahoma and Indian territories into a single State of Oklahoma. The citizens of Indian Territory tried, in 1905, to gain admission to the union as the State of Sequoyah, but were rebuffed by Congress and an Administration which did not want two new Western states, Sequoyah and Oklahoma.