Why would you not expect to find many steep hills in far East Texas?

About Deep East Texas

The 12-county Deep East Texas region stretches from Nacogdoches County south down to Tyler County, and from Trinity County eastward to Newton County on the Louisiana border. It includes cities such as Nacogdoches, Crockett, Lufkin, Center, Livingston, Woodville and Jasper.

East Texas is mostly Prarie.

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

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 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.