11 million (10,423,130 acres) acres, is the right answer.
Explanation:
Approved on 27th September 1830, and announced on 24th February 1831, the Treaty of Dancing Rabbit Creek was an agreement made between Choctaw American Indian tribe and the U.S. Government. This treaty was the primary treaty enacted under the Indian Removal Act. Around 11 million acres (45,000 km²) area was ceded to the Choctaw Nation following this treaty in exchange of 15 million acres of area in the Indian territory.
