Which of the following was not one of the nations that governed Texas?

The correct answer indicates that Great Britain did not govern Texas at any point in its history. Texas was governed by several different nations, but Great Britain was not one of them. The Republic of Texas existed as an independent nation from 1836 until it was annexed by the United States in 1845. The Confederate States governed Texas during the Civil War when Texas seceded from the Union. The United States has had a significant governing role over Texas from its annexation onward.

In this context, while Great Britain might have had interests in Texas during the early years of colonization and the era leading up to its independence, it never had direct governance over Texas as it was never a colony or a territory of Great Britain. This sets it apart from the other options, which reflect actual periods of governance.