What prevented Sam Houston from seeking a second term as president?

Sam Houston did not seek a second term as president of the Republic of Texas primarily due to political tensions and opposition he faced during his first term. His administration was marked by conflicts with other political factions, and after his presidency, he was more focused on serving as a U.S. senator and later as governor of Texas. Additionally, the political landscape in Texas was shifting, and he was wary of the divisive issues surrounding annexation and relations with Native Americans, which influenced his decision not to pursue re-election.