Final answer:
The Five Civilized Tribes referred to in the question are the Muscogee (Creek), Choctaw, Chickasaw, Seminole, and Cherokee, who acculturated to Anglo-American culture and were forcibly removed via the Trail of Tears due to the Indian Removal Act.
Step-by-step explanation:
The peoples referred to in the question are part of the Five Civilized Tribes which consisted of the Muscogee (Creek), Choctaw, Chickasaw, Seminole, and Cherokee. These tribes were known for adopting Anglo-American culture to various degrees, including English language and Christianity, and for their response to policies that ultimately led to their forced removal due to the Indian Removal Act. The Cherokee nation was particularly well integrated, with a written constitution, a three-branch government system, and the publication of a newspaper, The Cherokee Phoenix. However, despite their efforts to acculturate, they faced immense pressure to relocate, most infamously on the journey known as the Trail of Tears, where they were forcibly moved from their lands in the Southeast to what is now Oklahoma.