Final answer:
The material provided does not contain a specific answer to how many land systems were used in Texas history. To answer accurately, one would need to consult a specific historical source on Texas land systems.
Step-by-step explanation:
The question is asking about the number of land systems under which Texas land has been organized in the state's history. Although the provided reference material does not directly answer this question, it discusses government systems, the land ordinance of 1787, and characteristics of American settlers in the Mexican province of Texas. It is important to note that cadastral systems are related to land organization and may hint at the variety of systems adopted. However, it does not specify Texas land systems explicitly. Considering that the reference material does not contain the specific answer, it is recommended to consult a source which specifically addresses the historical cadastral or administrative land systems of Texas to obtain the correct answer.