Red Clay State Historic Park is a state park located in southern Bradley County, Tennessee, United States. The park preserves the Red Clay Council Grounds, which were the site of the last capital of the Cherokee Nation in the eastern United States from 1832 to 1838 before the enforcement of the Indian Removal Act of 1830. This act resulted in a forced migration of most of the Cherokee people to present-day Oklahoma known as the Cherokee removal. At the council grounds, the Cherokee made multiple unsuccessful pleas to the U.S. government to be allowed to remain in their ancestral homeland. The site is considered sacred to the Cherokees and includes the Blue Hole Spring, a large hydrological spring. It is also listed as an interpretive center along the Trail of Tears National Historic Trail.

After the Cherokee removal, the site became private land and was primarily used for agriculture. In the later part of the 20th century, a group of local historians undertook an effort to preserve and protect the site and turn it into a state park. The site was named to the National Register of Historic Places (NRHP) in 1972, and Red Clay State Park opened to the public in 1979. It encompasses 263 acres (1.06 km²) of land immediately north of the Tennessee–Georgia state line and consists of a museum, replicas of Cherokee structures that once stood on the site, and three hiking trails, along with other amenities.

Before the arrival of the first European settlers, the area was inhabited by the Cherokees, an Iroquoian-speaking people believed to have migrated south from the Great Lakes area, where other Iroquoian tribes arose. Their territory encompassed parts of present-day western North Carolina, western South Carolina, East Tennessee, northern Georgia, and northern Alabama. The Cherokee peoples in Tennessee were known by European settlers as Overhill Cherokee because they lived west of the Blue Ridge Mountains. In the late 18th and early 19th centuries, the Cherokees organized a national government modeled on the United States Constitution and were recognized by European Americans as one of the Five Civilized Tribes. After the Hiwassee Purchase of 1819, in which the Cherokees ceded their lands between the Hiwassee and Little Tennessee rivers to the federal government, the Indian Agency—the official liaison between the U.S. government and the Cherokee Nation—was moved to the site of present-day Charleston along the Hiwassee in 1821, which is located approximately 23 mi (37 km) northeast of Red Clay. In anticipation of a forced removal of the Cherokees by the federal government, White settlers began rapidly moving into the area.

Between 1827 and 1831, Georgia legislators passed a series of laws that prohibited the Cherokees from holding public meetings and nullified all Cherokee laws within their borders. In 1830, the federal government passed the Indian Removal Act, which authorized then-President Andrew Jackson to negotiate removal treaties with Native American tribes in the Southeastern United States. As a result of these actions, the Cherokees began to vacate their capital of New Echota, with the council temporarily meeting in Chattooga, Alabama in 1831. The following year, the Cherokee Nation permanently moved the seat of their government to Red Clay due to the site's central location and the abundant water source from the Blue Hole Spring, which they considered sacred. By 1836, the site had grown to include 91 log buildings.

A total of eleven general councils were held at Red Clay between 1832 and 1838 under the command of Principal Chief John Ross, each attended by an estimated 4,000 to 5,000 Cherokees. During the meetings, the Cherokees sent delegations to Washington, D.C. to argue to Congress and the President on their behalf, and repeatedly rejected agreements to surrender their lands east of the Mississippi River and move west. While these councils were ongoing, a pro-removal faction known as the Treaty Party arose within the Cherokee Nation, led by Major Ridge, his son John Ridge, Elias Boudinot, and Stand Watie. This faction believed that removal was inevitable and in the best interest of the Cherokee people. On December 29, 1835, they secretly signed the Treaty of New Echota at their former capital, without authorization from the national council at Red Clay.

The Treaty of New Echota was considered by many Cherokees to be an act of treason and was rejected by the council at Red Clay on February 2, 1836. Later that month, two councils convened at Red Clay and Valley Town, North Carolina (now Murphy, North Carolina) and produced two lists totaling some 13,000 names, written in the Sequoyah writing script of the Cherokee language, of Cherokees who were opposed to the treaty. The lists were dispatched to Washington, D.C., and presented by John Ross to Congress. Nevertheless, a slightly modified version of the treaty was ratified by the U.S. Senate by a single vote on May 23, 1836, and signed into law by Andrew Jackson. The treaty provided a grace period until May 1838 for the Cherokees to voluntarily relocate themselves. To prevent a Cherokee uprising, Brigadier General John E. Wool ordered approximately 300 men to take up position near the Red Clay Council Grounds in mid-1836. The final council at Red Clay took place in August 1837, in which the Cherokees made a final unsuccessful effort to retain their lands. The Cherokee removal officially began on May 26, 1838, and the Cherokee agency at Charleston served as the military operational headquarters for the removal, with Fort Cass constructed on the site to house detainees. Many additional detention camps were located in northern Bradley County between Charleston and Cleveland, with two of the largest at Rattlesnake Springs, where tribal officials agreed to continue their system of government in their new home. The removal became known as the Trail of Tears.

A village known as Red Clay was established south of the park on February 29, 1840, in the present location of Cohutta, Georgia. A large tract of land that includes the site of the park was sold by the state government to Frank Kincannon and John D. Traynor in 1841. Another tract was sold to John B. Marston the following year. The railroad, which had been planned through the area prior to the Cherokee removal, was completed in 1852, and a train depot and section house known as both "Red Clay" and "State Line" was constructed on the site. Most of the council grounds remained farmland. At least three skirmishes took place along the railroad at Red Clay during the American Civil War. On November 27, 1863, two days after the end of the Chattanooga campaign, Union troops destroyed the depot and tracks at Red Clay in an attempt to prevent the Confederate Army from using the railroad through the area. Beginning in 1864, the site was used by the Army of the Ohio as a staging ground in preparation for the Atlanta campaign, with additional troops under the command of William Tecumseh Sherman arriving months later. A group of Union scouts engaged in a skirmish nearby on May 3 of that year, and the troops began moving south four days later.

The railroad depot and section house were rebuilt sometime after the Civil War and were later demolished, probably in the 1930s. The land that is now Red Clay State Park was sold and divided multiple times in the roughly 100 years after the Civil War and continued to be used as farmland. An African American church and cemetery are also speculated to have existed on the site sometime after the Civil War. By the 1930s, the exact location of the council grounds had been forgotten, and some speculated that they may have been located in Georgia. This misunderstanding likely resulted from the Red Clay community's location in present-day Cohutta. Local historian John Morgan Wooten conducted research in 1934 and 1935 that established the approximate location of the council grounds. However, the Georgia chapter of the Daughters of the American Revolution placed a historical marker commemorating the site less than 1⁄2 mi (0.80 km) south of the state line on November 10, 1935.