"[Although the] State of Coahuila and Texas is a part of the Federation, [it is] equal to the other States of which the same is composed, and it is free, sovereign, and independent in whatever exclusively relates to the internal administration" - Article 2 of Decree No. 1, Constitution of the States of Coahuila and Texas (1827) What constitutional principle does this Article best represent?

Texas’ gulf coastal plains are the western extension of the coastal plain extending from the atlantic ocean to beyond the rio grande. its characteristic rolling to hilly surface covered with a heavy growth of pine and hardwoods extends into east texas. in the increasingly arid west, however, its forests become secondary in nature, consisting largely of post oaks and, farther west, prairies and brushlands.