Question: Okchai are a Muscogee tribe, they formed part of the former Creek (Muscogee) Confederacy in Alabama, prior to which event, which was a policy of the United States government in the 19th century whereby Native Americans were forcibly removed from their ancestral homelands in the eastern United States to lands west of the Mississippi River, thereafter known as Indian Territory?

Context paragraphs:
Creek Freedmen: Creek Freedmen is a term for emancipated African Americans who were slaves of Muscogee Creek tribal members before 1866.  They were emancipated under the tribe's 1866 treaty with the United States following the American Civil War, during which the Creek Nation had allied with the Confederacy.  Freedmen who wished to stay in the Creek Nation in Indian Territory, with whom they often had blood relatives, were to be granted full citizenship in the Creek Nation.  Many of the African Americans had removed with the Creek from the American Southeast in the 1830s, and lived and worked the land since then in Indian Territory.

Chickasaw Nation: The Chickasaw Nation is a federally recognized Native American nation, located in Oklahoma.  They are one of the members of the Five Civilized Tribes.  The Chickasaw Nation was created after the Chickasaw people were forcibly removed by the US federal government to Indian Territory in the 1830s.  Their removal was part of a larger effort by the federal government to relocate Native American peoples from the eastern side of the Mississippi River; in the Southeast, these were the Cherokee, Muscogee (Creek), Seminole, Chickasaw, and Choctaw nations.  The removals became known as the "Trail of Tears".

Indian Territory: As general terms, Indian Territory, the Indian Territories, or Indian country describe an evolving land area set aside by the United States Government for the relocation of Native Americans who held aboriginal title to their land.  In general, the tribes ceded land they occupied in exchange for land grants in an area purchased by the United States federal government from Napoleonic France, the Louisiana Purchase.  The concept of an Indian Territory was an outcome of the 18th- and 19th-century policy of Indian removal.  After the Civil War, the policy of the government was one of assimilation.

Okfuskee: Okfuskee are a Muscogee tribe.  They formed part of the former Creek (Muscogee) Confederacy in Alabama, prior to their removal during the 1830s to the Indian Territory.

Indian removal: Indian removal was a policy of the United States government in the 19th century whereby Native Americans were forcibly removed from their ancestral homelands in the eastern United States to lands west of the Mississippi River, thereafter known as Indian Territory.  In a matter that remains one of debate by scholars, description of the policy—which clearly contributed to devastation in numbers, freedom and prosperity for those displaced—is sometimes elevated to being one of long-term genocide of Native Americans, in any case, a consequence of actions first by European settlers to North America in the colonial period, then by the United States government and its citizens until the mid-20th century.  The policy traced its direct origins to the administration of James Monroe, though it addressed conflicts between European Americans and Native Americans that had been occurring since the 17th century, and were escalating into the early 19th century as white settlers were continually pushing westward.  The Indian Removal Act was the key law that forced the removal of the Indians, and was signed into law by President Andrew Jackson on May 28, 1830.

State of Sequoyah: The State of Sequoyah was a proposed state to be established from the Indian Territory in the eastern part of present-day Oklahoma.  In 1905, with the end of tribal governments looming (as prescribed by the Curtis Act of 1898), Native Americans of the Five Civilized Tribes—the Cherokee, Chickasaw, Choctaw, Creek (Muscogee), and Seminole—in Indian Territory proposed to create a state as a means to retain control of their lands.  Their intention was to have a state under Native American constitution and governance.  The proposed state was to be named in honor of Sequoyah, the Cherokee who created a writing system in 1825 for the Cherokee language.

Okchai: Okchai are a Muscogee tribe.  They formed part of the former Creek (Muscogee) Confederacy in Alabama, prior to their removal during the 1830s to the Indian Territory.

Coyaha people: The Coyaha people, sometimes known as the Yuchi, (also spelled Euchee and Uchee), are people of a Native American tribe who traditionally lived in the eastern Tennessee River valley in Tennessee in the 16th century.  The Coyaha were well known mound builders.  During the 17th century, they moved south to Alabama, Georgia and South Carolina.  After suffering many fatalities due to epidemic disease and warfare in the 18th century, several surviving Coyaha were removed to Indian Territory in the 1830s, together with their allies the Muscogee Creek.  (Some who remained in the South were classified as "free persons of color"; others were enslaved.)  Some remnant groups migrated to Florida, where they became part of the recently formed Seminole Tribe of Florida.

Southern Cherokee Nation of Kentucky: The Southern Cherokee Nation of Kentucky (SCNK) is an unrecognized tribe based in Kentucky.  Members of the SCNK claim descent from the Cherokee forcibly removed to Indian Territory in 1838, and to have first emerged as a distinct political faction known as the Treaty Party before the Trail of Tears, c. 1835.  They report having fled Indian territory, after the American Civil War, c. 1871 for Kentucky to escape Reconstruction era violence.  The City of Henderson, Kentucky published a proclamation stating they have been headquartered there since the late 19th century, and according to the "State-Journal" of Frankfort, Kentucky, they are assumed to be the oldest Native American presence in the Commonwealth of Kentucky.  The SCNK states it had an estimated one thousand members as of 2009, living in several US states, and that it is "not affiliated with any other group calling themselves Southern Cherokee".

Trail of Tears: The Trail of Tears was a series of forced removals of Native American nations from their ancestral homelands in the Southeastern United States to an area west of the Mississippi River that had been designated as Indian Territory.  The forced relocations were carried out by various government authorities following the passage of the Indian Removal Act in 1830.  The relocated people suffered from exposure, disease, and starvation while en route, and more than four thousand died before reaching their various destinations.  The removal included members of the Cherokee, Muscogee (Creek), Seminole, Chickasaw, and Choctaw nations.  The phrase "Trail of Tears" originated from a description of the removal of the Cherokee Nation in 1838.

Supporting paragraphs: Okchai Indian removal
Answer: Indian removal