Question: What organization which the The Alabama people Native Americans were a part of owned the land the Wellborn house was built on?

<P0-S0> Koasati (also Coushatta) is a Native American language of Muskogean origin. <P0-S1>  The language is spoken by the Coushatta people, most of whom live in Allen Parish north of the town of Elton, Louisiana, though a smaller number share a reservation near Livingston, Texas, with the Alabama people. <P0-S2>  In 1991, linguist Geoffrey Kimball estimated the number of speakers of the language at around 400 people, of whom approximately 350 live in Louisiana. <P0-S3>  The exact number of current speakers is unclear, but Coushatta Tribe officials claim that most tribe members over 20 speak Koasati. <P0-S4>  In 2007, the Coushatta Tribe of Louisiana, in collaboration with McNeese State University and the College of William and Mary, began the Koasati (Coushatta) Language Project as a part of broader language revitalization efforts with National Science Foundation grant money under the Documenting Endangered Languages program. <SEP> <P1-S0>  The house was built in 1837 on lands that had once belonged to the Creek Confederacy. <P1-S1> Wellborn, also known as the Dr. Levi Thomas House, is a Greek Revival style residence in Eufaula, Alabama, built for Dr. Thomas Levi Wellborn. <P1-S2>  Wellborn had been wounded in a battle during the Creek War of 1836, and died of the wound in 1841. <P1-S3>  His family continued to live at the residence. <SEP> <P2-S0>  They were members of the Muscogee Creek Confederacy, a loose trade and military organization of autonomous towns; their home lands were on the upper Alabama River. <P2-S1> The Alabama or Alibamu ("Albaamaha" in the Alabama language) are a Southeastern culture people of Native Americans, originally from Alabama. <SEP> <P3-S0> The U.S. state of Alabama has 67 counties. <P3-S1>  Each county serves as the local level of government within its borders. <P3-S2>  The land enclosed by the present state borders was joined to the United States of America gradually. <P3-S3>  Following the American Revolutionary War, West Florida was ceded to Spain by treaty while the remainder was organized primarily as the Mississippi Territory, and later the Alabama Territory. <P3-S4>  The territorial assembly established some of the earliest county divisions that have survived to the present, including the earliest county formation, that of Washington County, created on June 4, 1800. <P3-S5>  In 1814, the Treaty of Fort Jackson opened the territory to American settlers, which in turn led to a more rapid rate of county creation. <P3-S6>  Alabama was admitted to the Union as the 22nd state in 1819. <P3-S7>  The Alabama state legislature formed additional counties from former native lands as the Indian Removal Act took effect and settlers populated different areas of Alabama. <P3-S8>  In 1820, Alabama had 29 counties. <P3-S9>  By 1830 there were 36 and Native Americans still occupied large areas of land in northeast and far western Alabama. <P3-S10>  By 1840, 49 counties had been created; 52 by 1850; 65 by 1870; and the present 67 counties by 1903. <P3-S11>  Houston County was the last county created in the state, on February 9, 1903.