"All new states are invested, more or less, by a class of noisy, second-rate men who are always in favor of rash and extreme measures, but Texas was absolutely overrun by such men"

This quote by Sam Houston is referring to the increase of people who relocated to Texas throughout the early 19th century. He is explaining these individuals as "noisy, second-rate men" who are in favor of "rash and severe measures". Houston is suggesting that these individuals are not the most dependable or credible, and that they are taking control of the state of Texas. He is alerting that these individuals might not have the best interests of the state in mind, and that their choices could be harmful to the state. He is likewise suggesting that the state of Texas is being overrun by these individuals, and that their existence might be a cause for concern. This quote is a warning to be wary of individuals who are moving to Texas, and to be aware of the prospective effects of their choices.