The two wichita settlements on opposite sides of the red river were known as

twin villages

Explanation:

At the beginning of the 1750s, the most important of the several Wichita tribes, known as the Taovaya, established two large twin villages, one on the north side of Red River in Jefferson County, Oklahoma and the other one on the south side at Spanish Fort, Texas. Those settlements were known as the Twin Villages.

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b) the confederacy had to pay all union war expenses.