Was an east-west split of Dakota Territory considered?

Legislation was considered to split Dakota Territory east-west at the Missouri River instead of the current north-south split that was approved in 1889.

A retrospective released by the state of South Dakota on the 125th anniversary of statehood noted that the east-west proposal did have some support.

The East/West Dakota would have followed the Missouri River and aligned regions with similar geographic and cultural identities.

The north-south border decision was motivated partially by resentment between the northern and southern portions of Dakota Territory over the location of the state capital. In 1883, the territory’s capital was moved from Yankton to Bismarck.

Other reasons cited included separate railroad systems, economic ties to major eastern cities (Sioux Falls and Fargo) and the growth of separate systems of public institutions.