Final answer:
The Choctaw established a trading post, the Chickasaw hired white tenant farmers, and the Seminole formed a national council as part of their respective reconstruction efforts after the Civil War.
Step-by-step explanation:
The Choctaw and Chickasaw nations, after aligning with the Confederate cause during the Civil War, took steps to rebuild and adapt their societies in its aftermath. The Choctaw focused on establishing a trading post and post office, reflecting an effort to integrate with the changing economic landscape of the time, which would match option 6 in the student's question. The Chickasaw, meanwhile, took actions such as hiring white settlers as tenant farmers, working towards economic reconstruction and matching action 5 in the question.
Both tribes rewrote their laws, protecting property and promoting trade (action 2), and re-established schools (action 4) as part of their adaptation towards a post-war reality in their territories. The Seminole pursued a different path, reflecting their distinct experiences and choices during and after the Civil War. They formed a national council (action 3), which ties into their efforts to secure and formalize tribal governance in the new context they faced.